Mule Deer,
At the known risk of making a fool of myself here on the 'fire, explain how the shim "behind" the recoil lug floats the barrel a little? I can see how a similar shim "underneath" the lug surface might "lift" the barrel off the forend surface a little bit but would also throw off the bedding alignment/geometry at the rear action screw.
Pardon my ignorance!
As a long term fan of pre-64 70's, I am grateful I have not had issues getting very adequate (and often stellar) accuracy out of mine. It never hurts however to have an extra "ace" up one's sleeve!
The front screw passes through the hole in bread bag tie, which lifts the barrel a bit.
