Have you taken a look at the top cam for any evidence of cam lean?

If your string does not come absoloutely straight off of the cam track the bow will be nearly impossible to tune......expecially with broadheads.

You may have already done this, but put the bow on a draw board, or a hook in the ceiling. Bring the bow to full draw and ensure that both cams reach the draw stops at exactaly the same time (possibly have the top cam every so slightly ahead)

Set your arrow rest so the bottom of the arrow is even with the center of the berger button hole (even with the berger button always ends up too low for proper adjustment)
I would also verify that your nock point is about 1/8" above level.