A little range report here....
I took the ole girl out and shot some "milspec" commercial ammo. It was VERY consistent as to where it shot..... it did group very high.... and so attempting to adjust it, I found that the rear base was VERY loose! As in I could move it with each shot... and with my lil finger! The staking apparently is no longer mechanically holding it in place.
I added a bit of thread locker and centered the base as to where it "should" be.... if it holds tight and groups well, then I will attempt to restake it.
Wish me luck!