which arrow?

[ericmerg]

so im shooting a 70# longbow shooting 2216's or 2117's with a 220 grain 4 blade broadhead theres a 82 grain difference in the arrows and only about 10 fps difference but i seem to shoot the lighter arrow best at longer distances(30 yards) im not sure i would take an animal at 30 yards but if the shot felt right i would shoot without a second thought , is there a big differance in 80 grains downrange with my bow or is my poundage enough where 80 grains is just blown off as its most likely going to pass through anyway i really like the heavy arrow idea but at 550 grains  at 190 fps im getting roughly 44.1 ft/lbs

while my 637 grain arrow at 175-180 is around 43 ft/lbs  to me i want to say thats such a little difference going with the increased speed and  distance is best but i havnt shot anything so i could be massively off base on this