Hi everyone. Have been enjoying my Onza very much, however I am disappointed with the speed I'm getting. The IBO of the bow is closer to 310fps according to Archers Advantage and OT2. I have it at exactly 70#, 27.5" draw and it is shooting a 557gr arrow at 233 fps, 480gr arrow at 255 fps and a 385gr arrow at 285fps. The bow is perfectly timed. What can be wrong with it??? Any info will be appreciated. Thanks.