Personally, I neutered my Gravity Shift for short PBA patterns and there is nothing better.
I need to reverse engineer the dual angle layout, but mmy GS has the pin 3 inches above my bridge, mb to the right of the thumb with a P3 hole, and a surface of 500 w/polish.
Perhaps what I found was an accident, because I was ready to give up on the ball, but there is nothing better on fried short patterns. It just clears the fronts easily, barely flips, and drives. The perfect mix of a flip and hook/set reaction.