I've heard this go back and forth for a long time. Some people believe that if your bow is tuned, they should fly the same. That simply isn't my experience. I've got a variety of different heads here, and some simply fly different due to the blades catching wind. That said, they fly good, no fishtailing or anything like that, but their poi is different. I don't really care where the poi is, so long as the flight is good. I've been shooting thunderheads the last couple of years. They fly great, but hit 4" low right of my field tips, so I move my sight a little bit and done.