Add in the point weight, insert weight, nock weight and fletchings weight and you' ll be closer to 500 grains. Some consider that heavy for a 29" arrow. I don' t, especially for an 80 pound bow. (80 pounds? Really???)

JeffB got me addicted to the Carbon Express Terminator Selects, same arrow you' re talking about, only a higher grade. I don' t know about the tolerances of the base grade you' re using, but I really like the Select version.