I believe a 75 degree MB, will give you a more angular motion. I have 2 BLAZING INFERNOS with close pin placement but 2 different mass bias placements, and and 2 very different motions. The one with a 75 degree mb is quite a bit longer before it makes it move, its a skid/flip motion. The one with the mb at 45 degrees is more of a early roll, kind of a curve motion. To be fair I would check your PRO SHOP for help.I have found a 90 degree (or stacked) mb to give medium length with a smooth backend.
I hope this helps. I'm sure there are some very qualified people at this web site.