Do you shoot 3-under? The reason I ask is I have helped a few guys with paper tuning and I have seen 3 different guys have this same problem. No matter what I did to the bow or the arrow, it still showed the same thing. The only thing that all three had in common was that they shot 3-under. One of the guys tried split and, wallah, he was shooting bullet holes. he did switch to split and tunes fine now. I'm not saying you need to switch the way you shoot, I'm just telling you what I have seen.
Good luck with it.
Bisch