I would have to agree with iJimmy that the arrow used for those tests should have been a 340, not a 400. Still, you could see that the low profile heads (Nitron, Turbo, and Sonic) did better with an underspined arrow situation. That's why when NY said his broadheads were 4" off, it seems like too much for those particular heads. IME, the Slick Tricks will shoot very close to field points even when the bow is not tuned really right. NY Harvester, I would say try 5-shot's link. He has really put his time into broadhead testing, spent loads of money on heads to test, and shares that info with us.