I am planning on buying new arrows soon. I am currently shooting Bass Pro Shops Carbon Fury. They weigh 11 gpi. My question is, should I go to a lighter arrow to shoot faster or stay with the heavier arrow for better penetration. I am shooting a Bowtech Justice set at 70# with a 26" draw. Yeah I'm a short armed little bugger. I am currently shooting at 250 fps. The numbers I have come up with puts me shooting around 60 pounds of kinetic energy. I am wanting to have the best speed and penetration I can have out of a 28.5" arrow. Any help would be greatly appreciated.