I can't speak with any authority about Encores but I have quite a bit of experience with Contenders. I thing that floating the barrel in the forearm channel and making sure that the ears are off of the frame do the most. I have used spacers under the screws, O rings, electricians tape, and am now using shims made from 12 gage shotgun shells cut in half long way and a hole for the screw punched in them. They all work.