I would guess that even though you hit where you were aiming, the arrow was correcting itself in flight and therefore u hit where u aimed. Its important, in a lot of peoples opinions to have proper arrow flight. Myself included. Its hard to believe that your broadheads maintained the same path as your field tips, given that paper tuning result. What I would do is download easton archerys tuning guide. It will explain what each tear means and how to correct the problem. Yes, you're gonna have to start over, but the outcome will be more true and reliable than your old setup, even though u hit where you aimed. Here's a link for ya....
http://www.eastonarchery.com/downloads/