RE: Bowtech Justice string twang noise
the arrows are borderline, you are probably right around 5 grains per pound. I was using 26" GTs with 125 heads and ended up switching to 6075 CE term hnters with my Justice (same specs 70# 28" draw)
Since switching arrows and going to catwhiskers on the string i have had a couple folks comment on how quiet my bow is. I use the standard Bowtech silencers on the limbs and cable, cat whiskers on the string and a LORE stabilizer