Never even got to the issue of the back end of the arrow being low.
Am I doing something wrong? Is there anything else to move to adjust for uneven left / right flight?
You should adjust your nock position first before adjusting anything else. Some folks like to adjust nock position by raising or lowereing the rest which is fine as long as you keep at least 2/3 of the arrow covering the hole in the side of your riser. I usually just adjust my nock position on the string first.
As for left/right adjustments , (assuming your a right handed shooter) a left impact indicates a heavy spine. You can either turn your poundage up until the arrow impacts the same as fletched shafts or try a heavier tip. Or you can try a longer arrow of the same spine or switch do a different spined arrow. Being a little over spined is not a big issue (to me anyway). How far to the left are your arrows impacting compared to your fletched shafts?
I'd also suggest backing up to 15 yards , 10 at the very least.