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Wow, getting PB with a 57 move solve is impressive. Quick trick to eliminate the rotation for the fourth pair, you can do U R D R' U R D' R' then insert. I randomly inserted with U' R2 D' R U R' D R2 which gave a ZBLL you probably know, but if anyone on earth can actually see that in advance I would be surprised.
Based on your solution I would recommend working on your cross efficiency/ergonomics. Of course, I don't know how good your crosses are generally, but I'm just going off of this one solve. If I had to do white cross here, I would probably do x' z DU Lw D' R D2 F2, where I would change the F2 to Dw' L' U L U2 L to get an xcross.
Ergonomics wise, your cross solution is essentially just setting 3 edges up into being one move from solved, then adding three moves to actually solve them. These 3 last moves can be done in any order as long as red goes before blue. When you plan a lot in inspection, you want to base that order mainly on what leads to the best F2L, but in this case that takes ages to plan becauss the solution is 8 moves. Just go off of finger tricks then, and based on that the best order for the last 3 moves is B2 R' F' (which, here, leads to better F2L as well)