well i would say put more pressure at the bottom of the thumb, make sure during ur preparetion to have it tight but still be able to take the thumb out clearly
--------------------
When a house bowler misses the mark, misses the break point and strike, for many ppl its called a wallshot. When a pro does that its call adjustment
When a house bowler gets his finger stuck in the ball and fall on the lanes, for many ppl its called lame bowler. When a pro does that its called the Machuga flop! ha i like this one.