I herd or read how Fred Eichler practices.... for the most part he a one arrow only for his "practice", and that one and only arrow is all that matters. And if he does shoot more that first one is the one that stick in his head weather he shot good or not.
Since learning this I've been doing the same thing. Like one arrow before I go to work in the morning and one when my chores are finished in the afternoon. It works! Totally committee to that ONE shot!