Try this. Look at the target and come to full draw. ONLY AFTER reaching your anchor set your gap. Continue looking at the target and in your peripheral vision just POINT the arrow at the approximate vertical gap. If the gap you want at,say, 20 yards is 2 feet low just allow your peripheral vision to estimate it. DO NOT SHIFT YOUR FOCUS TO THE ARROW. If the nock of the arrow is under your eye, you should have no (or little) left or right adjustment to make. Trying to keep the arrow on the "gap" during draw adds too much for our brains to process. ONE STEP AT A TIME.