If the bedding was done properly with even contact around the entire front of the receiver, then I wouldn't worry about relieving the bottom of the recoil lug.
I would certainly start with the easy stuff like checking to make sure fasteners aren't loose, but beyond that I would invest in a SWFA SS 10x to use as a backup scope, as well as another set of mounts. I've seen jumping POI numerous times due to a scope that wasn't holding zero properly, and swapping a known-good scope onto the rifle revealed the problem immediately. Of course I've also seen bad bedding, loose screws, etc, cause a shifting POI, but a bad scope or mount system is by far the most common cause, IME.
