In my experience rob . what is needed is spacers on the front mounting bolts ( inside and out of the stock ) with locking washers . so you are tightening down onto a solid so to speak . not just pulling in the stock as you go . i have always thought that what was needed was bolts coming out of the action , not in . extreme answer would be to weld em in . or get a puff gun ??? HOLLY
PS plius bedding and regular barrel cleaning .