Wish I knew more about the most complex system that makes the bike GO. Times like this one wishes that something was just flat out 'broke', to make it easier to find.
This is one of the 'luxuries' of my having 2 SH's, where I could start swapping out things before jumping into major parts purchases. Haven't had to do it yet but the option is there.
Thinking(?): The amount of fuel delivered is controlled by the ECM which detects the amount of air flow demanded when one cracks the throttle. So yours is possibly behaving like the throttle is always wide-open.
ECM?
Seems injector problems would likely go in the opposite direction constricting fuel flow normally(?)....
Fuel pump and delivery system is obviously working too well, so forget about that......
Times like this I wish I was a mechanic rather than a desk-jockey.
In this dumbfounded state-of-mind I would prayerfully start at the simplest thing and Hope that 'maybe' there is a poor contact being made on that 32-pin connector upon the ECM, and dis-and-re-connect it while washing it in contact cleaner????? Pathetic advice from a pathetic creature.......
The Factory Service Manual is of little help here in trouble-shooting fuel 'problems' so it appears that one may have to become more friendly with "Google" and possibly take advantage of someone else's plight.....
Have you scouted the Forum at this Forums mother-site?
http://www.urbanscootin.com/forum/Freedom is not something you are given. Its something you take.
It is totally stock, runs really well, 800 miles on it, tires filled to rated pressure, rider and gear weight of 195 pounds....
Full throttle quite a lot of the time at 63 MPH. But it was all flat ground and maximum pressure in the tires, so it should have been pretty efficient. It runs perfectly, although my top speeds is about 5 MPH lower than what most report. I wonder if there is a way to check or adjust the timing... 
