SHills
Basically from what I can tell you have raised the barreled action in the stock with shims. The shims you have chosen to use will also provide you a stable and sound lug base... so as you tighten the lug screws you will not be pulling the action further down into the stock.
I have down this with 3/4 omega's and it has worked very well. If the barrel is now floated it SHOULD set up the same harmonics in the barrel everytime you shoot it. Temperature, both the ambient temperature and the temperature of the barrel should not cause a change in the POI because there is room for the stock and/or the barrel to swell...
I believe it is still always best to have a barrel channel and action fully bedded. This combination should stop any movement of the barreled action in the stock and pressure will be applied equally. For a target rifle that you a making money with by shoot targets I think a full bed job is a priority... For a hunting rifle getting a 1MOA @ 100 is very respectible... If you read
spaniel's post he reduced his MOA a 1/4" by bedding his Omega...
If your gun as you have made thse changes shoots 1 MOA or 1.5 MOA - congratulations... I think you have made a worthy improvement.
The only thing you have not done is take any front/back movement out of the action - IF there is any... Usually the laminate stocks a fairly stong, especially with those deep lug pockets - just the opposit with the synthetic stocks...