This reminds me of Archery, my other favorite pastime. I can't find it online but my mother sent me an newspaper article about a guy from back home I know that said when he stopped worrying about the results and concentrated on the actions his scores increased greatly.

Now I found it and will leave my previous words.

John Weiss: Shooting for perfection - PostBulletin.com: Outdoors

Worry about the moment and your technique, the rest will follow.

Tim