1) Im not sure if this could help but dont put your thumb all the way in. My coach keeps telling me fingers in first than thumb assuming you have finger tips if i dont put my fingers in first my thumb will get stuck in the ball and you will hear a THUD cuz i get so much lift on the ball.
Another thing that could cause it to happen is when your pro shop checked you drilling, was it befor or after you bowled. My personal experience is that my thumb will swell up when bowling so you might just have to get your thumb hole beveled out.
2) When i bowl i do squzze a little more on my fingers than my thumb, as i said above i dont have my thumb all the way into the ball.
3) A straight follow through requires you to find your center of gravity while you bowl your leg (left/right) could be kicking up to much and you lose balance, its diffrent for everyone i think but im not the best on that![]()
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