Many of the Pros have gone to this type of grip from what I understand. It keeps them from grabbing the ball at the release and the shorter span enables them to still get good revs on the ball.
Chris Barnes and Jason Couch also use this type of grip.
The problem with the PBA lane patterns isn't getting the ball to hook, it's keeping it from hooking in the wrong places, and the only way to do that is to feed the ball down the lane to the breakpoint with as little force as possible, but still get enough revs to carry well and create good entry angle.
