Is this what your referring too?
Pitch changes to adjust ball roll . . .
This info is from a session with Mo Pinel and Del Warren. They do advocate pitch changes to adjust ball roll.
They start with what some here have called the "claw" grip. That is, a bowler's standard fit will include more forward pitches and a shorter span than has been the norm for many over the last few years. When the thumb is fully inserted and the fingers are laid across the holes, the edge of the hole/insert close to the thumb will be between the first and second crease/joint. They feel that a closed hand can remain more relaxed and still hold the ball without grabbing.
Once the "standard" fit is determined, adjustments can be made as follows (for right handed bowlers, lefties need to reverse the lateral adjustments) :
* To Increase Rev Rate - add 1/8 forward to both fingers and 1/8 reverse to thumb
* To Decrease Rev Rate - add 1/8 reverse to both fingers and 1/8 forward to thumb
* To Increase Axis Rotation and Tilt - add 1/8 left lateral to all three holes
* To Decrease Axis Rotation and Tilt - add 1/8 right lateral to all three holes
* To Increase Roll for low track players - Add 3/8 reverse to middle finger and increase middle finger span by 1/16. Add 3/8 forward to ring finger and shorten ring finger span by 1/16.
* To Increase Axis Rotation and Tilt for very high track players - Add 3/8 forward to middle finger and shorten span 1/16. Add 3/8 reverse to ring finger and lengthen span 1/16.
* Two or more adjustments may be combined for more dramatic results.
