I have 2 of these stocks, one on a 22-250 and one on a 243
My pal also has 2, one on a 243 and one on a 30-06
All of these stocks were straight drop ins out of the box, no bedding, no pillars etc
We've never had problems with zero shifting on any of the 4 stocks.
I think you may be looking in the wrong place for the source of your problem
Cheers
Bruce