RE: Question on 4 blade muzzys
Sounds like a tuning issue to me too. Most good broadheads these days can be made to hit the same place as field points.
Of course, if you are not interested in fine tuning your bow, you may be ok with re-sighting in your bow, as long as your group is as tight as you want it. That's an easy fix if you only want to shoot out to 30 yards or so.
If it was me, I would work on tuning it out, but then I'm kind of anal about that and it gives me something to do until season starts.