Greetings,
first off, I am NOT an engine expert, heck I dont know if I would classify myself as even knowlegable, but I will throw my two cents worth. I fly predominantly FP40x, in fact I have 8 of them lol, (its an obsession thing I guesslol)I was shown one way to tune them by one fo the local engine gurus. Basically it is to rework the timing on the boost (? I believe its the boost port, the center one) so, cant say anything about whetner Randy Smith worked the motor, but perhaps that will give you a better feelign that it is a legit tune. I love my FPs.