I'm going to buy some new arrows in the next couple of days . I'm currently shooting GoldTip expedition hunters out of a 63lb , 28" draw , Reflex compound bow . I'm going to get some Carbon Express arrows . I see that the Maxima's are 6.3 grs/inch ,,,,, this seems realy lite to me . The Terminators are 11grs/inch . I want a quick arrow ,, but don't want to "shock" my limbs . Is there a formula to tell how much arrow wieght I need ? Thanks .