There are times when something should be obvious but for whatever reason it escapes us, or at least me. For a long time I've been plagues with shooting high, anywhere from four to six inches. Oh I could shoot nice groups but always high. I tried raising my nocking point a wee bit. I tried staring at the spot until my eyes went crossed or hurt. I tried coming up from the bottom of the target. I tried to lower my bowarm but everything would fall apart. It drove me nuts at 3D shoots and cost me several misses on the local deer population.
Well, when I did the math, if I was shooting 4" high at 20 yards I would have to lower my bow arm about 1/8 inch to hit what I was looking at. That's when the light bulb started to glow, dimly but still a glow. What should have been obvious finally occurred to me. If I couldn't lower my bow arm, how about raising my anchor point. So I tried it. Magic!!! It was the last piece of the puzzle.
This worked for me. If you're having trouble shooting high it might work for you.