Ok. I tried to use the factory shims on the 300, no go. The brake does not thread on far enough to reach the shoulder of the barrel. I had to use the thicker accu-washers. I tried a thicker and thinner one, then the one originally used to rule that issue out. The rod would be in the same orientation to the brake, as in being close in that side, on which ever washer I used.
Then I tried a thin factory peel washer on the 556 barrel with a saker brake. Torqued a little over 30ftlbs to get a perfect timing on the barrel. Slapped the suppressor on and same issue, just doesn't seem as bad. It's a little closer at the 4 or 5 "o" clock position on the endcap(when looking at it from the front).
I tighted the Maad mount to the suppressor and no change. Then loosened it wondering if I over tightened it. No change
I used two different rods from CNC Warrior (556&300). If Inspin them in the barrel, there was no indication of them being bent or warped. The rod maintained the same orientation to the endcap.