Here is one way you can fit a recoil pad to a curved stock. I've used it to fit a KickEzz pad to my GH. I haven't had luck heating a pad to the proper shape so that there wouldn't be any gaps when mounted. Basically what you are doing is putting a screw in the middle of the pad and using the screw to draw the pad to the stock.
Here is the link to the tool:
http://www.midwayusa.com/product/143...hole-punch-1-4. I've also heard you can make the tool out of a brass rifle case of the correct diameter you need for the hole. Punch out the primer.
This tool is normally used to punch out a hole in the recoil pad for easy access to the stock draw bolt without having to remove the recoil pad.
Locate the center of the pad and use the tool to core out the rubber down to the hard base. The rubber will be in the tool when you remove it from the pad so use a small rod to take out the cored rubber and save it. Drill a hole in the hard base, the diameter of the screw you are using. Mount the recoil pad to the stock. Take the plug and cut it to the proper length so it's flush with the pad.
This would work with a solid rubber pad such as a Silvers or other similar pads. You've got the 2 big plugs anyway for the Silvers, what's one small plug in the middle going to matter? I don't know how this would look with the ventilated type of pads, the core would be smaller but would probably work too.