Be warned: more revs does NOT mean a better release. Wrist supports are so enticing because they promise results without effort - "visual effects". Even with a wrist device you can end up overturning the ball, it is just spinng faster but hardly gets more power. It might not be the true solution to the underlaying challenge, just a placebo.
A wrist device can be helpful, though, to bridge time while building up wrist strength. As you already mentioned, staying behind/under the ball is the key for a better release (not revs) - I once was in a similar situation and "fell for" a ProRelease, but found it too cumbersome as a whole. Anyway, after a while I used it only in order to back my wrist, keeping it from bending back in the downswing, while I left the hand free to move. That helped me a lot to develop wrist strength and getting used to the different feel in the course of some months. Weightlifting is helpful, too.
DizzyFugu - Reporting from Germany
2010/11 Benrather BC Club Champion
Confused by bowling? Check out BR.com's vault of wisdom: the unofficial FAQ section