This has helped me shooting at blind bales and may help you.
I have a small patch of shrubbery in the back yard and I put my bale in back of it so I have to make about a 10-15 yards shot at the blind bale THROUGH a hole in the bushes. I usually have to kneel and bend over to do this.
I've found you can focus intensly on your SPOT, pull the bow back anchor, release, follow through, the whole time focusing intensly on the spot. I guess the mind blocks out every distraction except the spot you are shooting at and I can hit it almost every time.