Deep Topic here but I'll share my experiences as ive done some experimenting with several hand positions.
When I was 15-22years old I used the cupped wrist. I wanted all the hook I could generate. That started hurting my wrist between 20-22 years old.
Then I started using the flatter hand release, less hook but still managable roll on the ball.
Then about 2 years ago I learned about finger positions.
My normal hand position is pinky snugged up to my ring finger with my index finger pointed and as far away as comfortably possible from my middle finger. Get the most side roll with this position.
If both pinky and index are stretched out comfortable the ball gets less side roll more end over end roll. The ball will generally roll longer before making its move. The break point is pushed down lane by about 2'.
If my index is snugged up to my middle finger and pinky is stretched out comfortably, the release is more of a full roller style. I use this hand position for my down and in shot.
Most bowlers i see here use the stretched index finger with a snug and curled pinky. They say the curled pinky will generate more side roll and even more hook. I dont see any difference with my normal position vs. the curled pinky.
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Mike Zadler
Using the best brand in the nation, BRUNSWICK!!!
Below, my stats from previous seasons:
http://members.bowl.com/SearchUSBC/ViewMember.aspx?prefix=552&suffix=12886
http://www.BrunsNick.com