So I returned to bowling after a 5 year lay off and been back for about 6 months. in that time back, I have been fitted two separate time from a pro shop. I tried Finger tip and was having pain so i went back to a sarge easter grip. My grip itself feels pretty good but something still feels off. The weight of the ball feels more towards my index and middle finger. should the weight be more centered in my palm? my release has been pretty solid since coming back but my ball reaction is so inconsistent right now.
Its going to feel that way because you took a portion of your hand and essentially tucked it away so the ball in that area has nothing to rest on. If you put your hand in front of you, palm facing you, and you bend your ring finger so the tip touches your palm, you will see that there is more of your hand available on the index/middle finger side to rest the ball on. Unless you have strong wrists and can cup the ball, the weight of the ball is typically off center a touch anyway which creates the axis tilt at release. If the ball was dead center, you would roll over your holes (think Thomas Smallwood).
This is why no thumbers and two handers have higher tracks and longer PAPs typically than those that use a thumb. Most two handers/no thumbers have PAPs at least 5 inches over (mine is 5 1/2 over). Some go as much as 6 inches over. Most bowlers that use a thumb have PAPs 3 1/2 to 5 inches with the few of those that have stronger wrists and can cup the ball through release to create PAPs over 5 inches.
You do have your anomalies of course like Michael Fagan who snapped the wrist at the bottom of his downswing and yet has a PAP of 3 1/2 over. But typically what I mentioned is what you see.