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I turned the pushrods with my finger and slowly tightened the adjusters until i felt resistance, then tightened 2.5 turns for .08 the first time and 1.25 turns for .04 the second.

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With many lifters it is very difficult to "feel" when you are at zero preload. It takes awhile to acquire the feel, and it is best to do it while watching the lifter to verify the results.

With the lifter on the base circle and the rocker adjustment sloppy loose, put the allen wrench in the adjuster and with it between your thumb and index finger turn slowly with no downward force and don't turn or even touch the pushrod. When you meet the slightest resistance, you're probably at zero. Adjust from there.

I think that others have said that the aluminum rockers are a little noiser than the steel ones on fast rate cam. I don't know this to be true.

I really appreciate all the responses. Hopefully I can get enough liberty tomorrow to pull the valve covers off and check everything over again. I'll set the preload at a more reasonable .03 and see if it solves anything.

One thing I hadn't thought of until now... isn't it true that the rocker shafts can be installed backwards as well as upside down? (i.e., there are four configurations that are possible and only one is right)?

I know they are not upside down but I never thought to check if they were backwards. One more thing to do tomorrow...

Correct. There are four was the shafts can go on, only one way is correct.

As said above!
I would be looking at the push rods binding on the outside of the intake ports. You always have to clearance them on stealth heads. friends was noisy as hell and I had clearanced them quite a bit as we were trying to get the lash right walla ports were holding some way over making it seem tight. More clearancing in car (not nice) and problem solved!

Well that's my

The cup of the pushrod isn't rubbing the underside of the rocker....correct? The number of threads under the rocker will determine that. It seems I had geometry issues with mine and had to get different length pushrods.