I would retune your bow by paper tuning and bare shaft tuning, just to make sure your getting bullet holes. I disagree with the comment you have to resight in for BH' s vs. field points. I have shot a good number of types of BH' s and through different bows, if my bow is shooting bullet holes and tuned I have yet to need adjustment when switching heads on the arrows. I have experienced minor changes in POI in the past but not what your experiencing. I would say it is in tuning, arrow stiffness, fletch, something is different that is causing poor flight on the new arrows and BH' s. You should get in the habit of paper tuning when you buy different shafts, BH or add gear to your bow. It can save you lots of pain and suffering.

Good luck