(R' B') //EO
(L') U' B2 D' R2 U R' //4a1 2e in 9
U (D^ B2 L2 B2 D'^) //HTR in 15
(F2 D2 F2 R2 B2 R2) //slice in 21
^=w //+0/21

Overwhelming scramble. Also has UD EO...

There were some 20s but all are pretty hard. +3 rzp, DR in 11, +2 rzp to 4c6e. And an 18 with +3 to rzp:
(R' B')           // eofb      (2/2)
(L D R D')        // arud-eofb (4/6)
(R F2 B2 L')      // drud-eofb (4/10)
(B2 R2 U' R2 D')  // htr-drud  (5/15)
(R2 F2 L2)        // fin       (3/18)
Solution (18): L2 F2 R2 D R2 U R2 B2 L B2 F2 R' D R' D' L' B R
But again quite hard to see +3 rzp, especially with it having 2 rzp altering moves (R/L moves in this case, something like U D R is much easier to spot compared to L D R imo)

L' U L //EO
(D' B') (U F2 D B L2 B) //2c3 2e in 11
(F2 U B2 U'^ B2 U^) //HTR in 17
(R2 L2 D2 L2) //slice in 21-1=20
^=w //+0

Had this backup from F U2 F variation before checking B L2 B:
...F U2 F' //2c3 3e in 11
(D) L2 U B2 R2 D' //HTR in 16
F2 L2 U2 R2 L2 D2 //slice in 22-1=21

(U' F D' B) //EO+rzp
L' F2 L2 B2 L U' // 2c4 in 10
R' U2 L' F2 D2 [L' D2 L' D2] //slice+4x in 19
F' B * U2 D2 F' B //slice in 25-2=23
There is no +0 via traditional methods BUT:
[]= R' B2 R' U2 //VR in +0 and then notice how all slice edges transfer to E slice after the first F' B
*=B2 U2 D2 F2 U2 D2 //6-6 solved :D

Funny stuff.

There is a 21 from variation of the DR but that is 9 move NISS HTR or 10 move linear HTR so not mad at missing that.

L U' F2 R' //EO
F (D B D2 B) //4a1 6e in 9
U R2 F2 L2 [D' B2 L2 U] //HTR in 17
B2 L2 B2 R2 D2 //slice in 22
[]= Dw' B2 L2 Uw' U2 //+1/23

Had several slices in 22 but no +0. DR is 22opt.

(D' F L' R' U) //EO+rzp 2c2e
(B [L' D2 L D2 L) //4b2 2e in 11 but lots of variations/double slice stuff
(R2] F U2 F') //HTR in 15
(L2 D2 B2 L2 B2 R2) //solved in 21
But wait! There is an I sequence.
[]= R' B2 L B2 R //-1/20

This time I guessed the right 5 mover :D

Also looked at:
(D L F) (R2 D) (U2 F2 L D) //4c3 in 9. 22opt.

EDIT: Lol I missed the 9 move 4a1 DR completely :D Being skill issued was actually an advantage this time...

U D R2 F' D' //EO+rzp 8c8e
(R L) //rzp 3c2e
B' F' R F' R' //4a1 2e in 12 
U2 D2 F' U2 F' R2 L2 B //HTR 8/20
[R2 L2 B2 L2] //M slice in 24-1=23 but 
[]= R' L D2 R' L' //+0 since R' L' cancel with inverse

rzp in 7 and DR in 12 but kind of in 6 and 11 since R L will double slice most of the time.
That's why my strategy was 1) check all 6-7 move HTRs 2) spam 8 movers from normal and look for double slice.

I didnt have any DRs in < 12 this whole attempt.

The other DR I looked at was:
(R L2 F L) (D) R2 L2 U2 D2 F U D //2c3 6e in 12 but at least it has F U D
That is 23 optimal but quite impossible to find since you need DR flip/HTR-2s stuff AND 5qt. I tried HTR-2s but obviously not 5qt on top of that...

There are 22s if you check the right 5 move extension on inverse R/L axis. Or switch the correct 4 mover

(B' R L) //EO
(D') B2 D2 B' D2 F U //4b2 2e in 10
D2 F (L2 B') //HTR in 14
L2 R2 F2 * U2 F2 //2e+slice in 19-1=18
*= F2 L2 B2 L2 F2 R2 //6-4 slice in 20
+1

There is also a slice in 20 from linear HTR on normal but +2

U' D' (B D) //EO
L' , U2 B2 U2 F' R //4c3 in 10
B^ D2 B^ U2 R2 B2 L2 F //HTR 8/18
U2 D2 B2^ L2 U2 //slice 5/23
^=w //+0/23

Almost missed the finish since it really tempts you to do F' R2 D2 for double slice.

L' F' U2 B //EO
R //rzp and switch because 1pair+21arm
(D L' D L2 R2 U) //one move to 0c4e on the other axis and 11 to DR
We can then remove the R to get 10 to 2c4.
So
L' F' U B (D L' D L2 R2 U) //2c4 in 10 but there is a jzp sequence on both sides so there just has to be something good...
L (R'^ U2 F2 R^ U2 R') //HTR in 17
F' B' U2 B F' //slice in 22
^=w //+0/22

There is even a 21 from this set of DRs but hard to check everything because there are variations on both sides...

Funny way to find the DR

F R' L D' B' //EO+rzp
R' F2 D L2 D' //2c3 0e (10). Bad subset but all sub12 DRs I had besides this were 4c3 in 11 or worse...
(R^) R2 F2 L' B2 D2 R'^ //HTR (17)
U2 R2 U2 F2 U2 R2 //slice (23-1)
^w //+0/22

Might be the first time I use 2c3 0e in final solution. Lucky 12 move finish.
Only 3 four move EOs so even I had to spam 5 movers...

Ties Mallard with reasonable settings

(L B R' F') //EO
D2 R' U L' U //2c3 4e in 9
(R) R2 F2 L^ U2 B2 R^ //HTR in 16
B2 D2 B2 U2 F2 //slice in 21
^=w //+0

Holy sprint scramble! I decided to only look for rzp in 4 on this one. And I didnt even have time to look at sEO skips.

There are few reasonable 20s. Especially this one:
(R' D L2 D')       // eoud       (4/4)
                   // rzplr-eoud (0/4)
(U2 L R B' R' F)   // drlr-eoud  (6/10)
(L D2 B2 L' U2 R)  // htr-drlr   (6/16)
(B2 R2 F2 R2)      // fin        (4/20)

I had the 9 move 2c5 from that (same line but without the U2) but I didnt realise that U2 was a "nothing" move...

There is also a 19 in there but that doesnt seem like something I would reasonably find.

(R L B2 D) //EO
(F) R2 D2 F2 L2 B //2c4 in 10 with 4 variations and lots of 6-7 move HTRs
(R) L D2 L F2 L' //HTR in 16 just switched (R) and spammed 5-6 movers from all vars.
F2 L2 D2 F2 D2 F2 R2 //solved 7-1 = 22. Easy to see as well since F2 makes 2 squares already

There is a 21 from this exact DR but it is 4 moves to 4b2 2e and NISS. Or 10 move linear HTR. So not really realistic on such a variation heavy DR.

There is also another 21 that I had the rzp for but missed the DR. Should have found that...
But all in all I have been solving quite well lately! 

.//sEO for S edges on U/D
(B R') //rzp 3c2e
(F R B' L) //DR-1s in 6
U2 R2 B R L //2c3 4e already in sq-sq trigger in 11 (there is a 10 move 2c3 4e on inverse but that wasnt good)
U'^ L2 U' L2 F2 D^ //HTR in 17
R2 D2^ B2 L2 F2 //slice in 22
^=w //+0/22

Again DR-Xs!
This one was horrible to check. Since for both DRs the HTRs from opposite side of U R L are horrible so I just had to spam million HTRs from variation heavy side until I got lucky...

But this is the best possible for human from that DR-Xs. There is a unique 20 but you need to go to DR-2s instead and do weird stuff so I dont think that is findable:
nissy-# solve -o -t 64 R' U' F U' D' L' D2 F' B' R B R' D2 F2 U2 R2 F2 B' U2 L2 D2 L2 F' R' U' F (B' R F R B')
L2 F' R2 D2 B' D2 B' R L U' F2 R' L F2 R' (15)

There is an 18 from random 5 move EO that is free if you just hit the right EO but whatever.
Then there is a 21 from 2+2 NISS EO that I maybe should have found but not devastating misses for my level...

R2 U2 L F //EO
D (U2 R U B2 R2 U') //4b2 2e with variations in 11
(F2 B2 [L U2 R']) //HTR in 16
(D2 R2 F2 D2 F2) //slice in 21
[]= Lw' L2 U2 Rw' //+1/22

Great mo3 this week! And 2nd solve was really cool as well!

. //slice-EO + 4c4e rzp skip on R/L axis for E-edges
(B2 D2 B' L2 D') //2c4-1s 5/5
F2 R2 D F' B //2c3 4e 5/10 There are several variations of this.
(B2 [L' D2 L' U2 B2 R) //HTR 7/17
(D2 R2] B2 R2) //double slice 4/21 but really in 20 since once you slice out F' B the last R2 on inverse cancels with the D on the DR line.

There is no good solution for the S slice but if we solve M first we get:
[]= R' B2 R' D2 F2 R U2 L2 //S in +0/21

Then we have:
F2 R2 D {F' B R2 B2 L2} U2 R' F2 D2 R B2 R B2 D L2 B D2 B2
And now the S-slice is much better:
{} = D2 B2 U2 B F' //-1/20


SUCH A COOL SOLVE!
But wow that was a lot of double slices I needed to solve. Good thing I know VR :D

U (U B D') //EO
L F2 L D2 [F' L2 B //4a1 4e in 11
(L^ D2 F2 D2 L^ U2 L') //shortest HTR on inverse. HTR in 18
(D2 R2^ U2 [F2 B2) //double slice in 23-1 but really in 21 since we have F2 B
[]= B' U2 F //slice in 21
^=w //+0

DR is 20 opt with 3qt through 0c0 4e. 8 move HTR...

F' L R' U //EO
F' R F R' //4c4 in 8
(R2 F^ L2 B) D2 L2 B' D2 B'^ //HTR in 17
R2 D2 B2 D2 //slice in 21
^=w

Super simple solve. You have to solve 4c4 but the optimal solution is exactly of the form you should be looking at first:
Shortest possible reduction to 4b2 2e (on inverse in this case) and then NISS.

U (L' R' U) //EO
(R) R' F L2 B' R //2c4 in 10
U2 B'^ (B'^ L2 U2 B' D2 B) //HTR in 18
(L2 D2 F2 R2 D2) //slice in 23
^=w //+0 

(L' U' B) //EO
(U' R) U' D2 R' D R //2c3 4e in 10
(L2 D' B2 [D R2 U') //HTR in 16
(L2 B2 U2] F2 B2) //slice in 21
[]= Dw R2 U' L2 B2 U Uw //+1/22

I'm kind of losing motivation for FMC lately :/

U D' L' D //EO
R (B2 R2 B D2 L) //2c4  10/23
(B' R2 F D2 L2 F D2 F') //HTR 18/23
(L2 D2 F2 D2 U2) //slice 5/23
widen everything //+0/23

I wrote down 11 different sub12 DRs and every single one was 4 or 5 qt :D

(R2 B U') //EO 3/3
F' //jzp 1/4
(R2 F D2 {F' L2 B) //4b2 4e 6/10 with 3qts of jzp to work with!
R U2 D2 [R2 U2 B2 L' //HTR 7/17
B2 L2] U2 {B2 //double slice 4-1/20
[]= L2 D2 F2 L' F2 R2 //slice +0/20
{} = Bw L2 Fw //+0/20

NICE!
This was the only DR I looked at. I also tried to solve few other double slices from this.

(D) B U 3/3
F L R' , B R' F R' //2c3 2e 7/10 Cursed DR line :D
D2 B^ (B'^ D2 B) //HTR 5/15
U2 R2 F2^ U2 R2 U2 R2 //slice 7/22
^=w //+0/22

DR is 21 opt but with 5qt :D

Also had:
U (F2 D) ( U2 F U2 R' F' L) //9 move DR but 4b5...

U L2 F R L (U' L2 U' L2 U' F) //2c3 4e in 11 but ending in F R L so potential. But there is nothing great. Best findable is 23 and optimal is 22 again with 5qt.

F L U //3/3
(B2 R U2 L2 B R2 B) //2c3 6e 7/10
R^ B2 U2 F2 U2 R D2 R'^ //8/18
F2 R2 D2 B2 D2 B2 //6-1/23
^=w //+0

Also had:
F L U, R, D2 B L2 D2 B L //4a2 4e in 10 but cursed since corners are all in same layer on both sides. 24opt.
F L U', F, R' B2 R2 F2 L' F //2c4 in 10 easy linear 23opt.
D2 F L U B R2 F2 L U2 B2 L //2c3 4e in 11 with variations and this one is +5 to HTR. Also 23opt.
Edit: I am an idiot. There is a 10 move 2c3 4e from here and it has an easy 22....

R' (R') //EO 2/2
U F' , R2 D2 R2 U' B' //4a2 2e 7/9
L2 U (F2 R2 L2 D') //HTR 6/15
F2 U2 //pseudo FR 2/17
F2 L2 B2 R2 F2 U2 //solve 6-1/22

Also had:
R (R)
F B , D' F U2 B //0c3 in 8 that is 21 opt but missed it.

Also the R2 U2 L2 U' F variation of the 4a2 2e is 21 opt but it is NISS HTR with M U2 M U2 type insertion to HTR so I missed that HTR.
nissy-# solve -o -t 64 R' U' F D B' D B2 R' U2 L R B2 R B2 F' L U' F' L2 F' D2 U2 R' U' F R' U F' R2 U2 L2 U'
B D2 F' B U R2 U2 F2 L2 F2 R2 U F2 R' (14)

D' L' F' U //EO+rzp 4c6e 4/4
R2 F' R2 B2 R^ B2 L^ //4a1 4e with variations and double slice potential 7/11
([F2 R2 D2 L2 F']) //HTR 5/16
(U2) //double slice 1/17
^=w //slice +0/17
[]=Fw2 R2 F Fw' D2 L2 Fw' //+2/19

Nice!

(U2 R2 B2) //EO 3/3
(U' L') F2 U L2 D' [R //4a2 4e 7/10
(R2 U B2 U2 F2 R2 D) //HTR 7/17
(B2 D2 [B2 L2) //double slice 4/21
[]= (R' L U2 L) //slice +1/22
Widen all U/D turns post-DR for +0/22

B D L U F' //EO+rzp 5/5
D U2 F2 R //4a2 2e 4/9 (There is also D' B2 L for 4a2 4e in 8 that I spent a lot of time on but that is absolutely horrible...)
(R2 D) F2 U B2 U2 L2 U' L2 U //HTR 10/19
F2 L2 U2 L2 D2 //solved 5-1/23

This 8 move DR is insane bait! There is one unfidable 14 and insanely hard 15s from that. 
And this extension to 9 also sucks.

I also tried extending to 
F2 R2 F2 D' B2 L //4a2 4e in 10 but no luck there either...

Got way too stuck on this and didn't therefore have any other good DRs...

(B' U' F') //EO 3/3
(U]) D2 L D2 F2 L' D //4b2 2e 7/10
{L2 B2 L' D2 L} //HTR 5/15
F2 [U2 F2 U2 //double slice 4-1/18
[]= U D R2 D U2 //slice +2/20
{}= Lw2 B2 Lw L2 D2 Lw //+1/21

Optimal from all DRs I looked at.

Had so many promising DRs this attempt including:
(B U' F , L2 U) U2 L2 F2 L R2 D //4a1 4e in 11, 23opt
(B U' F' , R2 D) F2 B2 D2 L R2 D //4a1 4e in 11, 23opt
(D2 B' U' F') (R' F2 L' R2 U) //0c3 in 9, 24opt :D

And then a bunch of decent subsets in 11 or 2c4 in 10.

This ties cubelib with my settings!