Thanks for the testing.
I think you have settled (by this test) one of the two biggest internet rumors - that AK's cant hit barn door outside of 25 yards (the other being that AR's are not reliable and can't shoot more than 30 rounds without breaking).
Obviously, with good optics and decent ammo the AK is reasonably accurate (though I know that the AR will best it at longer ranges).
I have several AR's and several AK's. I much prefer the ergonomics of the AR but I still prefer the AK overall. I can understand why many prefer the AR though.