Thanks for the inputs guys, but I figured it out. I couldn't find my Easton tuning guide that I'd printed, and I didn't have time to download it on this stupid dial-up. I finally found it. What I didn't know is that it IS the group and the impact point in relation to fletched shafts that is important in bareshaft tuning.

On a note that'll make me sound extremely unobservant, those new Gold Tip Pro Hunters I bought turned out to be fletched STRAIGHT. I never even noticed. No wonder I was having problems with broadheads. Duh.[:@]