Yep, I'll check the stocks for pressure points.
One thing that especially puzzles me is that it get MUCH worse with short rifles.
Probably has something to do with the shorter sight radius.
By the way, canting the rifle will usually change POI low and in the direction of the cant. I have seen it put rounds off target at 25m...and usually, IME, a right handed shooter will tend to tilt it in toward the body (left)