Anything over 300 fps would be extremely difficult if not near impossible to tune if he were shooting a fixed blade broad head. There is no need for that much speed. The op needs to increase his arrow weight if anything. 370 gr is a bit light. Maybe go up to 450gr. But then you inevitably see a decrease in speed. That is where it gets tricky.I would worry more about 280 fps and 370 gr than the broadhead for a 100 yard shot. That combo won't do diddley if you hit anything more substantial than a rib at that distance. I would want 320+ and an arrow in the 4's myself. That's off the top of my head, you could run the numbers.