It all comes down to tuning each arrow. Any fixed blade broadhead will "fight" with the feathers or viens. There's a list of things to do to get them to fly straight. FOC is one problem and correct broadhead weight is a factor in that. The other is vien clearance on the rest. I dont' have a cross bow and have no clue how they work, but from one's I've seen I dont' think there is such a thing as clearance. Does a bolt get the same "whip" as a bow? If it paper tunes fine then there's no problem.
If your arrows fly straight, but just lower, I wouldn't worry about the difference in pin settings. Mark for field points and adjust the whole pin rack (if you can) and set for broadheads.
I don't think I've ever had my field points and fixed blades hitting in the exact same hole with any bow I've used. As long as they are in tune and fly straight, I'll adjust my sights accordingly. I was out last night shooting my fixed blades at 50 yards. It's a beautiful thing to watch a perfectly tuned fixed blade fly straight and hit it's mark at that distance. Sure is a confidence builder!
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Perfect Practice Makes Perfect
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