I don't pretend to be expert enough to offer an opinion and have it taken seriously, but ... I still have one.
I know that when the B/A can "squirm" within a not-quite-perfectly-fit bedding block, POI can shift. I've seen that with several B/A I had in one particular stock at various times. If that's the case, then a skim-bedding job can help.
I don't, personally, like anything touching the sides or back of the tang on the action, just a pad underneath. I want the cylindrical section of the action to control side to side motion and the recoil lug to control fore and aft motion. I don't want the tang acting as a secondary recoil lug.
Just one madman's opinion, though.
