The key to good broadhead flight is a proper spined arrow that has a high FOC and a good amount of fletch. This combination will not only do well in controlled "arrow tuning" conditions, but will benefit you while hunting in crosswinds or when hitting small twigs/grass. As long as you keep these parameters within a certain range, you can probably shoot 1000 fps without problems. The difficulty is always coming up with this combination and have it be a light arrow. To make the arrow stiff enough to handle the high FOC, you generally end up with something that is too heavy to be a real speed demon. Fortunately, speed is not an important factor while hunting.