There are people that bowl without the thumb in the ball by cupping it in their palm using only their finger tips in the ball. I've never seen it the other way around with only a thumb. If your ball is drilled for your hand and your thumb is a little loose then you can use tape in it to snug it up. They sell bowlers tape with different textures and such and it does the trick. I personally just use 3M electrical tape but bowling tape is wider and is rounded either on one side or both. As far as revs it depends on a great many things with your approach and release. Plus if your ball is drilled conventional (where your middle and ring finger go into the ball to the second knuckle) or fingertip (where your middle and ring finger go into the ball to the last crease by your finger tips). In order to really help, more information is needed and or a video of you bowling which would be a great help.
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