A lower backswing could be keeping you out of timing resulting in muscling the ball at delivery. Having a good backswing without muscling it is imperative to accuracy.
How many steps are you taking and when do you start your push off? Do you push off or immediately let the ball get into swing? Check YouTube for a video that has Chris Barnes explains the 4 step and 5 step delivery. Check how he pushes the ball off on the 1st step of 4 delivery and from 2nd step of the 5 step delivery. This will help keep timing in check. I always go back to that video when I am slumping and need to get back down to basics.
Now for revs, not an expert but I don't think the back swing is going to give more/less revs. That is all in the hand position at delivery at the line and how your thumb and then fingers come out of the ball.
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