Heavier is better,....momentum equals penetration! There is always a debate here and elsewhere about elk weight bow and such, 50# will get the job done, but a bit more there is better too. Adding weight to wood arrows is done by soaking them, fully imersed, in Watco or other sealant. It's not going to add a ton, but I don't know any other way. Switching to four fletching increases arrow weight as well, and changes the FOC which in turn makes a heavier broadhead mandatory for great arrow flight.... all in all, MY opinion is GREAT arrow flight (tune it every way you can find until it really and truely is flying like a dart) and a RAZOR sharp broadhead out of a 50# ow will get the job done. Good luck.
Semper Fi