ok, i got it now. Well I will tell you that I get prolly 66 lbs of KE out my arrows and set up. I have 360 gr arrow and pull 71.5 # at 26.5" draw for around 288 -290 fps. smooth mods, with your draw and pull, why would you want the speed mods/?? You got to be over the 300 fps mark, are you ??