If you believe your bow is tuned as you say. Then broadheads shouldn't have that much difference then your field points. Long as your using the same grains. When broadheads hit totally different then your field points, thats often a sign of a improper setup. Ex. arrow spine to length of shaft to bow poundage. Or a improperly tuned bow. Broadheads often show problems that field points won't. Its not always the broadhead like many think. Your going to have to shoot some heads to truly find out. Then if see a major difference thats when you'll need to figure out why to resolve the problem of adjusting & readjusting your pins. Its just part of it. Get it right if its not, and its one less problem & headache down the road.

Before you can or even should tune a new bow or a bow that has just received a new string is to shoot the bow about 150 or so times to stretch the string. Once the string has been stretched, you will most defiantly want to paper tune your bow. You may have finessed the pins and rest to get the arrows to hit the target with a field tip, but put a fixed broad head on it and it will surprise you. The only way to truly tell if your bow is tuned and shooting as it should is by paper tuning it after you have stretched the string. Tune it before stretching the string and you will end up with an out of tune bow.

Death From Above