Thanks for the tips Bill. However, I am particular about who I take my gun to and I like to keep it local and visit the shop so I can see what kind of operation it is. In this case I had Match Grade Machine in St. George, Utah thread and recrown my barrel. He did an excellent job and building barrels is all they do, though he doesn't normally do ARs.
I have got the gun shooting what it did when it was new, so I am happy. It just took a lot more load development than I had anticipated, and I quickly found myself in a panic.
I think that slop in my upper and lower was playing a part in things too. Which would explain why I and others have experienced a degradation in accuracy after putting a number of rounds through these guns. I am going to try and remove the shims to confirm this as Doug suggested and to resolve an argument with my brother.
One thing to note, once I got it shooting like I wanted a severe wind came up and blew over my chrono and, well, took my gun off the bench where it fell about five feet to concrete (adjacent shooting platform is lower than the one I was on, which is where it landed). I hate the wind and this didn't help. I picked the gun up and it fired it, it was still on zero. I love my valdada scope.