I went from 1/8 left 0 forward/reverse to 1/2 forward, no need to short my span, and added 5 pieces of tape, result is better swing, rev rate increased, and see a lot more messengers, its a bit tuff at the beginning, as long as you relax your thumb and go for a shot without grabing the ball, it will come out nice. I would suggest go 1/2 and adjust backwards 1/8 at a time.
Remember, its just a bowling ball, if you don't try it you would never know.
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Laufaye