I use this trick racing cars, but film yourself in slowmotion with your phone and watch it back. You'll be able to see if your technique is good (do a couple angles) or if your broad heads somehow are pulling. IMO if I am shooting off it's me. Broad heads should only effect drop rates, unless something is broken.
I try to repeat my set up to make sure my shooting is the same every time by checking stance, drawing, lowering my shoulders and aiming. It takes 1000 hours to become a pro.
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