My bows are set at 60 lbs. as well, and I'm normally shooting arrows that range from 403 grains to 447 grains. Quiet. Good KE. One thing I would throw out, if you are eyeing those slim shafts on the Axis arrows, is that they penetrate really well. Particularly the Axis FMJ. Less resistance to those slim shafts and less arrow oscillation when the tip encounters resistance. I think the penetration compares favorably to a regular diameter arrow weighing 100 grains more. And wind drift is less. But speed is pretty much a function of weight, as previously mentioned.