Actually, instinctive blends rather nicely into gap at about 30-35 yards. I shoot purely instinctively at 20 yards also, because my arrow tip is so far below the target that it is easy to ignore. However, at some range, the arrow tip is right there in your field of vision, so why not use it. You don't have to go pure gap, where you estimate distances and calculate gaps, if you don't want to. At a certain distance, which you don't have to measure unless you want to, your arrow point ought to be about "there." This is what Howard Hill called split vision, where you are aware of the arrow tip in your peripheral vision, but remain focused on the target. It is a very accurate method of shooting at distances in excess of 30 yards. When you are shooting at closer distances and the arrow tip drops out of your field of vision, go back to pure instinctive.