Looking for some recoil reducing grips for my 629-6 / N-frame revolver.

I tried the Pachmayr decelerators since I had a good experience with them on a Ruger SuperRedhawk. Unfortunately for the N-frame, they fit like **** and the frame just wiggles up and down as I move it (even tightened the screw past the nut).

My 629 came with rubber grips that cover the full backstrap, but are pretty stiff. I have heard that the SW 460/500 may fit the N-frame, would they provide an improvement in felt recoil? Any other options out there?