Crossfires are pretty low profile heads, so they should not be a problem, but they do have little tabs at the back of the blades that are designed to spin the head to the right. If you are using left helical or offset fletching, it may cause a problem. I personally use Slick Tricks, and they fly very well, right with my field points out to 40 yards. Mechanicals are fine too, but it sounds like the tune is off just a bit.