Right on Tom. What flys well is what you use. I have never measured FOC and I kill deer and targets well enough thank you. Reported FOCs are a good place to start. I don't measure but I like a high FOC for carbons and aluninum does not seem to care but if anything I think they fly better with a low FOC somewhere in the 15% range. I really don't think it is important but I think you should have a higher FOC with broadheads.