As I posted in the following thread:
This is all about resistance. I have ZERO problems with the lean created other than you need to decrease the resistance possibly. By digging too deep to create more power you are lifting your scapula and rotating the shoulders. It would be interesting to see if you did not also have a side to side movement of your torso during these tire pulls and uphill runs. I have to believe this a reaction to longer GCT. I think the correction is to do a walking/falling start instead of a 3/4 point start.