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!
