L' F U D R'  //JZP 
F R2 L2 B  //DR  9+2c3  4E
([U2 B2 U R2 B2 U' F2 U')   //HTR  17
(R2 D2] F2 R2 F2 B2)  //E  22
[]=D2 F2 D F2 R2 U' L2 D' L2 U2  +0

I think it has great potential ，however no time for me to dig deeper

F2 B' U' L ,F2 D2 U' B' U'  9+4b2 2E
R2 U2 F' L2 F   X

F2 B' U' L(B U2 B' D' F D)   10+2C4  X

F2 B' U' L(R2 F D2 U' B U)  10 +4b5  X

Extend  DR ：
F2 B' U' L(B U2 B' L2 D' F D)  11+4b2  4E  X

F2 B' U' L(B U2 B' R2 U' B U) 11+4b2  4E  X

F2 B' U' L(R2 F D2 L2 U' B U)  11+4a1 2E  Not good enough， maybe try later

F2 B' U' L(R2 F D2 R2 D' F D)  11+4a1 4E   
HAVE A TRY:
(F2 R2 D2 F  L2 D2 F2 D2 F2 D2)  E 21  X
([F2 L2 U2 B'  R2 B2] U2 D2 R2)  S 20
[]=F B D2 L2 F' L2 F2  +1/21

Extend EO:
U2 F2 B' U' L,  F2 D2 U' B' U   10+6c4 X

U2 F2 B' U' L (L2 B D' F D)  10+4b3 X

Extend DR:
U2 F2 B' U' L (L2 B L2 D' F D)  11+6c3  4E
U2 F L2 F R2 F' U2 D2 B2   20   
GOOD  : ）

D2 B(R2 F'，L D)
(B2 R F2 R' D)  11+8C0  4E
(B2 R U2 D2 R')
(D2 L2 U2 # R2)
#=U2 L2 D2 B2 D2 L2 U2 F2 8-6/22

(U R' F D)
F2 D2 B D2 L2 B L  11+4b2 6E
(L2 F' R2 B)
(U2 L2 F2 U2 B2 D2 L2 F2)

R' U [R L]   //EO  
(U B)   // JZP in 6

Extend EO to get DR:
[]=F2 B2 R' L F   +3  DR  9+4b2  4E
SO

R' U F2 B2 R' L//EO  6/6
(U B) //JZP 2/8
F//DR 9+4b2 4E

super cool  ！！！

You'll get  (U B)R' U R L' U2 D2 B  9+4b2  without extend, same length

But I decided to check the COOLER DR first

(U B') R' U F2 B2 R' L F  //DR  9+4b2 4E
(U' R2 D)  //2E away from HTR   3/12
(R2 B2 # U2 L2)  //L3E    4/16

#=B2 R2 F2 D' F2 R2 B2 U'  +8-5/19 

Lucky insertion LOL

(D' F) U2 L2 D B2 U2 L' D2 R   10+6c4

L D(D'    B' R2 B R B2 R)   9+4a2

variation：  
L D'(D' ,  B' R2 B L U2 L)  
(F L2 F2 U2 F)  HTR  in  14
(U2 R2 F2 L2)   2E2E  18

(F' U2 F2 L2 F')   HTR in 14
(U2 R2 F2 # L2)  2E2E in 18
#=F2 U2 B2 R2 U2 F2 D2 L2  8-5/21

(L2 F U)   44N1L    F R2 L2 B R  8+2c4 with blocks

F2 R2 B R   44N1L   (R2 D2 B D2 B D)   10+4a2

(B L U2 L F)  JZP   R2 D2 B2 D  9+4b2  2E
                     extend to get better HTR:  
                                    R2 F2 D2 B2 D  x
                                    R2 B2 D2 B2 D  x
                                    R2 F2 U2 F2 D'  10+4b2   R U2 R  htr in 13   X

D' F' R  (B,  F2 D B U' B)  9+4a1  2E  (R2 U B2 U' F2 B2 D     L2 U2 L2 D2) DS 20

Nothing else good enough, decided to try 8+2c4:

(L2 F U)   //RZP44 N1L  3/3    
F R2 L2 B R'  //DR  8+2c4
B R2 U2 B R2 B' R2 B  //FR  WTF   8/16
R2 D2 L2//Fin  LOL   3/19