don't just pick a spot,,, with your bow hand PUSH that fist right towards the spot also and with what I think your doing wrong is "Dont move anything upon the shot,, Don't try to look for a hit or what the arrow does because I wonder if your looking up at the shot or even anticipating the hit and you either look up and drop your anchor or just dropping your anchor hand and pulling low resulting in the arrow going high..
seriously pay attention to Denny sturgis on this where he tucks his chin,, draw back-lock-release- and don't move anything until the deer bounds off,,, oh and have a 2nd arrow ready because not moving sometimes offers a chance at 2nd shot.
also a clean miss sux but a clean miss is a good miss.. T