I had a OP baby too - and the back labour was awful. Although according to my Health Nurse, not all OP babies are back labourish if that makes sense?? Although the woman is an idiot, so maybe dont rely on her too much!
Your midwife should be able to tell if the baby is OP I think. I'm sure mine knew after an internal during my induction.
Maybe do some crouching on all fours to help with the pain? I spent alot of time on a fitball rolling around to try and ease my back pain in those last few weeks.
Fi