Josh,
I've used crazy glue on pachymar and other pads to slick up the top and sides. On a really spongy pad like a decelerator the coating will crackle a bit after a lot of shooting, but still be slick. Here's a harder pad that is coated on the top down to the first screw hole and along the sides. I wrap a finger in saran wrap and apply it like that.Protect the black spacer with tape. It might take two go-rounds to get the coverage right. Once hard it can be polished with steel wool.