When I put my sure-grips on, I use a little sprinkle of baby powder or wind checker powder from my puffer bottle on the riser before rolling it on. A very little amount goes a long way.
This allows you to position and slide the grip around quite easily. This should help twist the sure-grip around to remove the wrinkle. Just roll it down a little bit past the throat where the wrinkle is, sprinkle some powder on the riser and roll it back up. You should be able to work the wrinkle out.