Well it would have to stay at 9gpp to keep my bow limbs in working order. I'd bareshaft tune to perfection with a small diameter shaft, then put the smallest fletching possible on that sucker. I'd be sure to tune it for 125 grain points, then I'd buy as many cheap old broadheads as possible to mount on the end of those arrows. I'd also foot the arrows with a half inch or so of an aluminum shaft. It is tough to build an ultralight arrow for traditional bows simply because the limbs require a fairly heavy arrow (usually).