I found that at times it is towards the middle of the butt stock that is doing the interfering and relieving it all except maybe a 1/4" all around the edge will work. Then if three still is problem, I use some red lipstick on the butt plate to find the pressure points on the stock.
Another method would be to use some black dyed Brownells accruglass ,with mold release on the butt plate and masking tape on the edges of the wood to keep the epoxy off the out side of the wood. Apply, screw down and let it cure. Finish off to flush and 600 then 800 grit wet sand paper.
I'm not an expert though.
