D' * L2 U'
(R F U2 R D2 L)//cool DR, 4b2 4e (9)
(F2 L2 B' R2 U2 B')
(R2)//2e+S (16)

*=S2//S in 18, +2 final

fun solution, though you can also get 20 without this hack, but it's harder

other:

(B' R2 B U2 B' L)//DR-1s (6)
(U2 F R L)//2c3 2e (10)

U' F2 D'
L (F U2 B' L' B2 R)//2c3 2e

(F L B2 R')
D (B' R2 D2 B2 D)//4b2 2e (10)

D (B' D')
(L' F R' L' B' R B)//4b2 

(U R B2 U)
(R D2 F U2 F2 R')//4b2 2e (10)
(F2 D2 F R2 B')
(U2 L2 D2 R2 D2)//20 to S, +1

spent most of my time on the HTR equal (U R B2 U R F B' L2 B' L) which has 13 to HTR but it's not great

E: of course switching this eo gives 19 yeah sure

other:

(L U' B F2 L)
(U2 B D2 F)//2c4 (9)

U (B' F' U)
R' U2 D2 R2 F L B//4b2 2e

R' F2 D2 B
D2 L' B2 D2 R2 U L//2c3

D' B (U2 F)
(L') R2 D B2 D B2 R//4a1 4e (11)

first try:

B2 U' B2 F2 R2 F2 R2//18 to E, +3 opt

I was pissed so I tried a ton of extensions of the DR, eventually at 55 min:

D' B (U2 F)
(L) R2 D L2 B2 D' U2 F2 L'//13 4a1 4e
F2 U' F2 B2 R2 U2 D2//20 lol

this is technically a 17 to slice +3 but it's nissy opt after D' B R2 (U2 F)

other:

D' F2 L2 R D
F L' F L2 B//cool DR, 2c3 2e