I find that one major tuning aspects when going from field point to broadhead, and it does not matter on arrow composition, is if the broadhead is a single blade head how the broadhead is oriented on the end of the shaft will benfit arrow flight not hinder arrow flight. That is if the blade is up and down with the bow string the arrow will have a tendency to not want to stabilize as it is being shot. The arrow is flexing from side to side as it is leaving the bow, the feathers are trying to stabilize the shaft but the blade is catching air and creating resistance. But, if the blade is oriented perpendicular to the string it is slicing the air as the shaft flexing thus letting the arrow stabilize and fly straight.
That is what I have found and I have been shooting since the early sixties.