Very interesting stuff Brian.
I actually did some down range testing a few weeks back on my AA 4.52's, only 40 yards as that's all I had at the time, I was surprised how little of a spread I had, so I must have a 'good batch', funny enough they group well at 45 yards but not pellet on pellet at 25 (my zero), but acceptable for what I need so it doesn't bother me.
I have been meaning to test some 4.51 & 4.53 to see how they fare through my barrel.
I also found with another batch of AA 4.52 that they were mega over the chrono (close up), but would put in shocking groups at any range I shot them at.
In life you should not persue goals that are easily achieved, develop an instinct for what can be only just achieved through your greatest efforts.