I am currently debating which arrow spine and wondering if someone can help. looking at Easton charts I can go with either a 260 or 300 spined axis. when I called Easton they said only the 260. I am shooting 70-72lbs, 29.5 draw, and will do arrows 28.5-29. ideally I would like to run a 100g broadhead with a 50g brass insert. I'm trying to avoid ending up with a 600g arrow. the shop was tuning my bow and eluded to some difficulty punching paper with 300 spine arrows making them question underspining. anybody have any recommendations on best approach? thanks