When I see league bowlers really start trying to figure out how to add revs, most of them end up looking like this guy here: hand on top of the ball and fully rotated around the outside.
This will produce a lot of skid, a modest hook, and a weak roll along with bad carry (maybe that's how he ended up with a 5-10
) All of that energy you're creating when you go through your approach...you're not imparting it to the bowling ball with a release like this.
I blame all the coaches who tell their students to imagine throwing an underhand spiral with a football. A proper bowling release is NOTHING like the underhand spiral. The underhand spiral requires to rotate your wrist around and over
the ball. You don't want to do that with a bowling ball.
A proper bowling release has the hand behind the bowling ball. (Not directly behind it;that will create an end over end roll great for spares. But only slightly to the outside.) Some pros get to that position by rotating from the inside of the ball and then uncupping the wrist to force it off the thumb quickly. That's how you create a very high rev rate. You don't have to do that if you goal is just to get a stronger release with better roll and carry. All you need to do is lock your hand in the position this guy is in, in the third frame of the series.