In the hunter class the arrows need to have 4 inch vanes, unless you shoot feathers, you will have to drop tip weight to possibly get under that making your FOC pretty low. I would not want to shoot any bow under5 grains per poundanyway. The shots are not over 35 yards in the hc, so flat shooting bows are not necessarily needed. I would think that a higher foc and a more heavy controlled arrow would win as the shots are in close and it turns into more of a shooting game and not a yardage and shooting game as the other classes. You are correct on the 280 rule though.