(R2 U' B R'，F)   //rzp4c4e  2p
F2 R2 U D F    //DR  10+4b2  6E
(L2 F2 U F2 B2 L2 U')  //HTR inserted S2
(B2 D2 R2 F2)  //Fin    4-1/20


also this interesting BB-DR mixed solution：

(B U)//rzp 4c4e in 2 wtf，but this case looks kinda hard
(R' F R)  //2x122，try some bb but also rzp 3c2e in 5，and finish dr won't break any block，nice
(B' L' B' L')  //DR  9+4b2  2E
(U2 # B' L2 B)  //straight to trigger but fake htr， but wait a second
(U2 D2) //L3C  in  15 wtf again

however I can only find 8-1
#=U' R' U L2 U' R U L2

nothing better than 22 was found with real htr too

opt for this DR is 21 with 4qts
best 3C insertion gives the same 21

(L' U B) L2 D F2 U2 L B2 R   //DR 10+6c3  4E
(D L2 B2 U' L2 U)  //HTR not good

(D' R2 U' F2 U')  //Fake HTR
Flip：

(L' U B)L2 D
(D' R2 U' F2 U')  //DR  10+4b2
(F2 B2 R B2 L)    
(B2 # L2 F2)    // 18 2E2E
#=U2 F2 D2 R2 B2 D2 F2 L2   8-5/21

tried switch side after dr but seems very far away from trigger，so switch back to check tons of variations....Luckily first variation gives me this direct 21  ：）otherwise I might get DNF


other：
nothing really good，best dr 10+4a4 opt gives 22💀

U R F，U2 L D2 U' L D  9+2c4

U' F2 L，D2 F(U F2 B2 D B)   10+4a3

R2 D R F(D' R U' D2 L)   9+4a4

(B' L2 D' B，D' L2 D R2 U' L)  10+4b4

(U' B L' D)D2 L' U2 D2 R' F  10+4a4

F B (F' U2 F)
U D2 L U' L' D'    //DR  11+4a2
(U2 R)F2 B2 R'   //HTR  16
F2 [R2 U2] R2   //E  19
[]=U' D B2 U' D'  +3/22

(D F B U')
(R' L F R' B' R)   10+4b2  4E
D2 R2 F' R2 U2 B
D2 Fw2 D2 L2 Fw2 L2 F2

U D2 R' B
(U2 R')
L2 F2 U' L'
(L2 D2 L2 D F2 B2 R2 U)   
(L R F2 B2 L' R) 

(B U L U' ，L)   //RZP 88
B2 R2 D2 F R L  // DR  11+6c3  6E
(R2 B R2 B' D2 B)  //HTR   17
(U2 B2 L2 F2 R2 L2) //Fin 23-2

RLUD gives another 11+3 here but nothing better than 21 was found
 
other：
(F U R U'，L D2 L' U2 L)  9+4b2  4E
(F U R U') F D2 L2 U2 D2 F  10+2c5

missing 17：extended EO legendary 11+4b2 4E
(L2 F U R U')     // eo-ud               (5/5)
(B)               // rzp-lr-eoud         (1/6)
(R' D2 L U2 R B)  // dr-lr-eoud [4b2 4e] (6/12)
(R D2 F2 L)       // htr-lr              (4/16)
(U2)              // finish              (1/17)

L2 F D' L B'，D'
U2 R' F2 R2 U
(F2 B2 R' F2 L)
(D2 L2 # U2 D2)
#=L2 F' B D2 F B'

(R' F' L' B)    //RZP44
R2 D F2 L'    //DR  8+4b3 
(D2 B2 U')R2 F2 L2 D' R2 D'  //HTR  9/17 
B2 L2 U2 L2  //Fin   4/21

backup：
(R' F' L' B)  R2 D F2 L    8+4b3 
(D2 B2 U' B2 D2 R2 @ U' B2 # U [R2 B2])  19 2e2e
#=B2 U2 B2 U2 B2 U2  6-4/21  leave M
[]=R L U2 R L' +2/23

other：
(R' F' L' B'，D R2 D' U2 L)  9+4a4
(R F' L' B'，D R2 D' U2 L) 9+4a2
(B2 R' F' L' B) R2 D F2 L  9+2c3  6E
(R D B' L D，L F' L)    8+2c5
(R D B' L D'，L F' L)   8+2c5

(B' U' F R2 D)
(B' R L' B)   DR  9+6c3  2E
R F2 B2 D2 F2 L U2 L   HTR  17
U2 B2 U2 D2 L2 F2     Fin 23

other：
L B' D F' R'，U' R2 D2 R2 F   10+6c4
L' D' R2 B' U'，F'(R' L B L B)   11+2c3  6E

(R2 B' R' D)   //RZP 42
D2 F D2 R' U2 R  //DR  10+2c3
F R2 <F' L2 F>  //HTR  15
[L2 F2 L2 U2]  //ES  19
[]=U D' B2 L2 B2 U D  +1
<>=F2 B D2 F2 B'  +2/22

other：
(B' R' D，F D2 F' R)   7+4b5
F B2 U' B，U R2 U L D' L   10+4b3
(R2 D' F B，U2 D' L F2 D)   9+6c3，2E
(B2 L U2 L，B2 L2 B' R2 B' D)  10+2c4

(F B R' D' B)   //RZP44  5/5
R2 B2 D' L   //DR  4b3  4/9
R2 U B2 U L2 U2 B2 D'  //HTR   8/17
R2 F2 L2 B2 U2 F2  //Fin   6/23

other：

B R D2 L' ,U', F' R2 D B' U   //DR  4b2  4E  5/10
(D2 F' L2 D2 B) //Fake HTR 0c 4q    5/15
(D2 B2)   //3C+S  2/17  Bad insertion

(F' B2 L D B,  D2 L2 U' D' L' D)   11+4a2  with cool trigger
This DR gives opt 21 with 2qts however I ignored it because it's bad subset :(

U2 F2 D2 F2 L' F2 U2 R2 D2 L D2  //Fin

(B' L R F，R D)  //RZP44
(R' B2 R L2 D)   //11+2c3  4E
U2 B2 L F2 L' D2 L //HTR   7/18

Flip：
U2 B2 [L F2 L' D2 L]
(B' L R F R D)
(L2 R F2 R)  //New  DR  4a1   17
(L2 U B2 R2 D2)   //M  22
[]=R U2 L' F2 R' L2  +1/23

other：
(B' L R F，R)
D' L2 D' L2 B2 L'    11+4b2  6E
U R2 F2 B2 U      HTR

D B' R'   //RZP36  3/3
L2 U F' U D2 B'  //DR 4b2  4E  6/9
D' R2 F2 U2 R2 U'   //HTR   6/15
L2 F2 L2 B2 R2 U2 F2  //Fin  7/22

other：

B' D R   (F B R2 F B2 U)  9+2c4

L2 B' D R (F2 U L2 B' U F)  10+2c4

(D' F' L，U) R2 D' B' U  8+2c4

(L U F L) L2 F2 U D' B' U' F  11+4b2  6E
(U R2 D)  HTR  14  not good