I hate sticking in my thumbhole. I always use a rosin puff ball to dry off my hands before each shot, wear the blue Vise Hada patch on the back of my thumb, and use slick black tape in my thumbhole (Frankentape from valentinobowling.com is my favorite). Provided I keep my thumb snug and blow a little air in my thumb prior to each shot to keep it from being too slick, I almost never have problems with sticking OR dropping the ball.