Food for thought. Using ArthurP' s stated arrow weight of 390 gr. I do not know what your fps is, but lets say 230 fps. Your 390 arrow will produce 46 ftlb of ke. If you increase your arrow weight by 10% to 429 gr you only increase your ke by 6 ftlb. Now increase your velocity by 10% and you get a whoping 63 ftlb of ke. Thats an increase of 9 ftlb, 30% more. So by going lighter on your arrow weight, you increase your velocity thereby increasing your ke. A lot of people fail to recognize the importance of higher speeds. More ke and you shoot flatter, increasing your effective range. Higher ke means better penatration. Just my 2 cents.