sorry, basic question, but I need some help: got an sc10. Replaced my ball diff. I'm almost positive I set it correctly (holding 1 tire & spur and not able to turn opposite wheel). However, I can't seem to tighten my slipper tight enough so that it has enough torque when I hit the throttle. Did I flatten my diff balls and have to rebuild it again? Or is there another problem? It seems like a slipper issue, but my slipper pads are new. any help would be appreciated.

FYI: using FT ball diff. In the past, I've used b-fast ball diff's with ceramic balls and they were always easy to set.