I'll second big bulls. Shoot a big heavy arrow and be done with it. Quieter, easier to tune, more efficient. The bow will use more of it's potential energy with a heavier arrow...

I shot my omen at 30"DL 66#'s 530gr arrow at 287fps. 97#'s of KE. Fast is cool, but around 300 is plenty fast for trajectory purposes... I was shooting a 2514 xx78 Easton aluminum.

You could go light and get more speed, but the difference in trajectory is not worth the above listed results IMHO. Like I said, speed is cool no doubt... But there isn't that much néed for hunting.