I stick a white plastic coffee cup lid on my dark red target. I used to shoot groups of four. Usually my first shot is the best, and I began to wonder if I had Robin Hood panic. (Not that the first arrow really had to worry about that.)
So for the heck of it, I made a son-of-William-Tell head out of a white bleach bottle stuffed with plastic grocery bags to sit on top of my block target. I put a red dot on the white background about the size of a silver dollar.
Now I shoot my first arrow at the white on red disk and then go for the smaller red on white. Now the second shot is better, and usually dead on.
I stopped shooting to miss, and now shoot a couple, take a break, relax, and shoot a couple.
This is probably no way to train for the Olympics, but it sure feels like it a better way to make one shot count. It seems like reversing the target/background from white on red to red on white really sharpens my focus.