Well the IBO of the General at 70# 30" drawis 300-308 fps with Smooth mods and 307-315 with Speed Mods. Obviously you are going to shoot 15# and 3" draw length below that. Draw alone will cost you approx. 30 fps. The Tube on the peep will cost you another 10 to 15 fps. 15# draw weight will cost you approx another 30 to 35 fps. Then if your arrows are lighter or heavier than 350 grains you will have to make some adjustments there. What spine Aramids are you shooting? The 3-49's would seem stiff to me at 25" for 55#. Here is a KE calculator if you can obtain the correct info

http://www.bowhuntinginfo.com/KineticEnergyNew.htm

Dan