Im reading this thread with great interest as I've noticed the same thing, or what I call a "Zero Throttle Flat Spot"
I've noticed this taking off from a dead stop mainly. Typically I'm not at Zero throttle when riding however there has been a time or two that I needed to when correcting a miscalculation in cornering speed. (new the to c14, not bikes).
I've taken up the slop in in the cables which helped the mechanical part of this however I feel there is an issue on the ECU end of it and am leaning towards the PC3 to iron out the flatspot.
Not too sure about the throttle tamer as being my solution though