AP your method of shooting is very similar to mine,except I shoot 3 under.I think it is much easier to learn this way.The gaps do become instinctive or muscle memory over time if you shoot the same bow arrow combo.I find that at 20 yds an under I dont even consciously look at the arrow.At longer ranges I find myself paying more attention to the gap when drawing the bow.This past deer season I had a tree rat come by me on the ground.I don't remember gapping or aiming.The shot presented itself and I just pinned his head to the ground at 15 yds.
CB