just shot my trykon xl through a chrono the other day, this is my set up and the speedi got out of it.
-30 inch draw
-72# draw wheight/80% letoff
-355 grain goldtip series 22 ultralight arrow
-305 fps
this is slower than i expected but the bow still performs great. I assume when they figured the ibo speed with a bow thathada 65% letoff, and of course didn't have any thing on the string.