2Blade, if ya can hit at ten, twenty should be there too. I had a very similar problem earlier this fall. I was short drawing, and accuracy suffered big time. I finally figured out what I was doing wrong...I wasnt aiming my shoulders, or using back tension.
Come to full draw, and then "flex your shoulders". If you do this and end up drawing another inch, work on it. I also practiced drawing(with back tension), aiming for a full ten seconds, then slowly easing down. I would do this five times and then shoot one arrow.
Disclaimer: I am by no means an expert, just relaying what helped me after numerous hours browsing through the threads. Hope it helps.
And if you are ever down here and want to chase bunnies....look me up.