Well I have noticed the same thing when either shooting spots or 3-D. What I found to be the best is to not grip the bow at all. I place the handle in my hand and just kind let me fingers curl around the front with no pressure on the bow. There are alot of muscles and tendons in the hand that can effect consistency. I have also found and noticed that the smaller the handle the more consistent. I cannot shoot a big fat handled bow very effectivly.