Nothing, of which I am aware, will reduce your rev rate: you have to do that.
The gloves/devices that help you get more "roll" on the ball than spin are those that extend a hard piece of support over the back of the middle, ring and pinkie fingers, like this one:
vs.
the ones that have the long finger support over the index finger, which help you spin the ball more, like this one:
Just an FYI: I am NOT recommending any of the above gloves. I just used their designs as examples. To be clear, I have no opinion one way or the other about these specific gloves.
