John,
Lots of good advice. I will throw my two bits in.
I have read a few articles on Sports Psychology and how it deals with archery in particular. When we focus on the output, or the result, an archer can get frustrated with poor outcomes.
When an archer focuses on the process of making a good shot, we can have more success. Concentrate on shooting a good arrow, going through the process well each time, and the close hits will come.
I will be honest here, I have a short attention span. I can not maintain adequate focus for half a dozen arrows, so I only shoot three at a time. I can shoot three good arrows but not four or five. A sixth is always better because after a bad number 4 and 5 I buckle down, but the damage is done. So... I just shoot three. I have tried practicing my concentration skills with puzzles, brain teasers and the like. It helps I guess or maybe I am just rationalizing goofing off. Don't seem to have any trouble concentrating at the fly tying table or fletching arrows for hours on end.
One last thing. I have a shooting buddy who is an amazing shot, when he doesn't get too far into his own head. We shoot 3-D together. Two poor shots in a row and he falls apart because he gets upset. I always have to remind him that we are supposed to be having fun. When I get him to relax and "don't worry, be happy" he is back to dinging 12s.
Concentrate on the process of shooting not the outcome. Don't over-tax your ability to concentrate and have fun. Guess I could have just said that and saved you from reading all the other.
OkKeith