I've chronographed severalBowtech bows with a true IBOarrow for the rigand I've found that they are 10-30 fps slower than what's statedon the birth certificate.
It's not my typical mature to call someone out like this, but what in the world are you smoking? If you're getting speeds 10-30 fps slower than what they advertise, then I seriously suggest you have your chrono checked.
Both of my Bowtechs which are not new models by any means shot within 2fps of what was stated on the birth certificate and that could be variance between the 2 chronos. Give me some examples of the results you have seen.