Maybe it's not a bow problem. Maybe it's an ARROW problem. Have you tuned your arrows to your broadheads? Do they spin w/ no wobble? How old are your arrows? Is it possible that the spine is gone? Have you used a G5 ASD to square the end of the arrow and insert? Are you blades aligned w/ your fletching?

Your bow could be perfectly tuned, but if your arrows aren't.....You may as well pee into the wind my friend.....