If your broadhead does not fly like your field pt then your bow is not tune correctly.
And if you change anything with your set up you need to retune. Bow hunting with the modern bows is a lot more techie than in the pass. You should go to your local archery shop and start there if your bow is not in tune. Even the most expensive arrows very in enough weight to shoot wide.
My broadheads are VPA or shuttle "T"