[Three Peaks]

Sounds like you are eliminating each item as you go. One thing I sometimes do is run the engine with the valve covers off to see if there is any obvious indication of problems with the valvetrain. It is messy and a hit or miss solution, but I have found several issues this way over the years that were relatively easy fixes (and a couple that weren't).

One other thing to try- not sure how well this will work but you could put a dial indicator on the head and see if all of your rockers/pushrods are moving the same amount. If they vary by more than a few thousandths, you probably need to adjust again.

Have you checked to see if your push rods are the right length? Just throwing things out here to see if each item has been eliminated. Eventually, if you eliminate all the other items, it works down to one thing. My money would be on rocker adjustment.

Bob