best drs were
(U) U' B D' B L B2 F' L' F // 4b4 (10)
(U) B' U B' D L2 D2 L2 F' D2 F // 2c4 (11)

R F' L U // eo (4)
D2 F // 2x2x3 (6)
(B' L2 B' L) // f2l-1 (10)
(L B' L' B) // 3c (13)

R F' L D2 U B' [1] F L B L2 B L2 B
[1] [B U B', D] (+8-3=18)

lmao

L B' U' D // eo (4)
R' F2 L2 U2 D2 F' R // 4a1 (11)
F (U2 L2 B' R2 F2 R2 B) // htr (19)
(D2 L2 U2) // slice (22)

...[F U2 L2 D2 B' R2 F2 R2 B] L2 U2
[] = B R2 U2 L2 F' R2 B F U2 F (+1=23)

looked at 
R L F2 R L' F // htr (16)
and a slice variation of the dr that also gives htr in 16 but couldn't find anything off that

other drs:
(L' F) D' B // eo (4)
U, R2 D2 L B2 R2 D // 4b3 (11)

R' L B // eo (3)
(L2 U' F2 R2 D' R) // bad (9)

B' D B // eo (3)
R, (F2 R2 D' B2 U' L) // 4a1 (10)
U2 F2 U // htr (13)
F2 L2 F2 U2 R2 U2 L2 B2 // solved (21)

initially i found
F2 U2 F2 U // htr (14)
D2 B2 L' R' D2 R2 B2 D2 L R' // solved (24-2=22)

optimal is 20 and i guess findable but pretty tough:
D2 B2 U' // htr (13)
R L' D2 [1] B2 R L // leave S (6-2=17)
[1] = U D' R2 U' D B2 (+6-3=20)

also found another 22 off a different dr (21 opt)
L' D B2 R' // eo (4)
B, (D2 B' U' B') // 4a3 (9)
(F2 U L2 D2 F2 [1] U' R2 B2 U') // htr (18)
(B2 U2) // 2e2e (20)
[1] F2 D2 L2 F2 D2 F2 L2 D2 (+8-6=22)

(...F2 U F2 D2 F2 L2 [D2 U' R2 B2 U' B2 U2])
[] = D F2 R2 U' R2 U D (+0=22)

B (R U B') // eo (4)
(R' U L2 B2 U D' R') // 2c3 (11)
R2 U L2 B2 [D' B2 D // htr (18)
R2 B2 U2] R2 B2 // slice (23)
[] = U D2 R2 U L2 F2 D2 (+1=24)

(B F L F) // eo (4)
L' U', R' U F2 U // 2c3 (10)
(R) D2 F2 D2 L U2 R // htr (17)
B2 D' U L2 D U // solved (23)

there is a 20 off this dr but it is pretty tough to find because i would not try nissing this, (U2 D2 L) L' B2 R'