for many years I shot a recurve, matched the spine cut to fly used 125 grn. points and didn,t woory about the weight factor, Since switching to the longbow I have found this to be more important in the way the bow handles, them long limbs are alot happier when that arrow reaches 9 to 10 grn and up, question I have is the alums come up short in the weight dept for the poundage I,m shooting, can one add weight to the frount of alum and keep a balance there. There wouldn,t be a problem if I backed the bow to say 55#, but I,m not ready to give up mine yet. My bow is around 70#@28 inches, 2117 with 125 grn points 555 grns, 2020,s aren,t much different.