What do you consider to be TOO light of an arrow for deer hunting? Been playing with a few new arrows, and even though they seem pretty light (330 gr.) I think they might be decent for deer. 350 spine, 125 gr. head. Should be around 16% FOC I'm guessing. 65# bow, and they should be flying at around 315-320 fps. Did some calculating, and the KE should be around 74. I know the momentum will be a little low though due to the light weight. What's your thoughts?