I struggled with this for three years. Tried lighter, heaver spine,brace height. I found that raising my head a little or making a constant effort to keep my anchor in tight will move the arrow to the right. Both were not part of my natural shot. I read somewhere to touch your thumb and little finger nail together. This did not work for me, but then I read Dick Palmer say the same thing. Decided to give it another try, still couldn't get it. For me thumb to little finger knuckle is what fixed the left problem. Sorry for the long post just wanted to explain the order of what happened to me. Not saying I am a good shot, now I hit the right just as much as I do to the left.