RE: Bare Shaft Tuning
More info would sure help. What bow weight and drawlength. Length of arrows and what kind. What type of rest?
Did you try shooting different distances with the broadheads? It sound much like your arrows may be underspined. Another possibility is too much tension on the rest, which will kick the tail end of the arrow up as it leaves the bow.
One other thing is that when tuning (paper or otherwise) you should get the vertical tear taken care of first, then do the horizontal.