Al, I don't understand why you don't want contact between the pillars and the action. What problem(s) does that cause?
There's a couple of reasons.
-Even the best bedding epoxies exhibit some amount of shrinkage....no matter if it's Marine Tex, Pro Bed, etc. The thicker the bedding compound is, the more the shrinkage plays into things. But you don't want a potato chip thin amount of bedding, either. When you have the pillars in hard contact with the action, over time the pillars end up as the main support points, not the bedding.
-I feel that the action should only be in contact with one type of material. Not two. Since the expansion ratio of 6061 aluminum is very similar to fiberglass, it works good for pillar material. But both are quite different from any brand of bedding material. When doing pillars for a carbon fiber, graphite or Kevlar stock, 7061 is my choice for the above reasons.
Besides performance, bedding done this way is extremely good for longevity.
Here's an example. This gun came in for trouble shooting. The bedding and stock work was done by someone else. It never would tune up that well. There was always about 1/2 to 2/3rds of a bullet of vertical that just couldn't be tuned out. It had multiple barrels, scopes, bullets, neck tension, powders, seating depth...you name it, it was tried. But the same characteristics showed up no matter what what components were changed. Clearly, something else was going on.
With a dial indicator, it showed under .002 of movement. But as I studied the bottom of the action, there were two subtle shadows on the bottom of the action. A clear sign that those areas were the only spots the action was being supported at. The bottom of the action was coated with Dykem and bolted in. When it came apart, the pillar marks were the only visible signs of contact.
I milled the tops of the pillars down .050, scuffed up the existing bedding and rebedded it. Suddenly, all three barrels became killer good ones.
The gun tuned up the way it should and followed all the normal patterns exactly as it should. Ten years later, it's still winning. And the bedding is as good now as when I rehabbed it (longevity). I use the same approach whether it's a competition rifle or a hunting rig with composite or wooden stocks.
When it comes to bedding methods, every style has it's good and bad points. The approach I take has proven over the years to have more on the 'plus' side of the page than the 'minus' side. It's more work than most styles, of course. Most simply won't put in the time it takes to do a correct bedding job and/or don't take the time to really understand what it is that bedding is about. Bedding is the #1 most misunderstood and poorly done area of an accurate rifle.
Here's a few others in different stages showing the recessed pillar tops.
Hope this helps.