I set my feet facing the low house window. It's sounds like your hold point is good. I mount to the break point then wind back using my legs, not twisting my body then lower the gun from my shoulder. I look slightly left of the barrel straight out to the base line. Try and put your eyes on the exact height the bird comes past to pick it up early.
What lead picture do you see? I find I need to shoot right at the front edge of the target to break it or my gun speed carries me way out in front.