Welcome, sorry your experience has been unpleasant with your EFI America. I also dealt with a snatchy throttle but I wonder about this,

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As I said in several threads, the damn snatching, together with the constant stuttering between 2000 3000 RPM prevented me from enjoying this beauty at least at slow speeds. After taking her several times to the dealer's shop and getting the same answer over and over (it's the bike's normal behavior, nothing's wrong with her, bla bla bla), after blocking the SAI, removing the O2 sensor, fitting long TOR's pipes and remapping a thousand times the ECU, I got tired and decided to sell it, as the situation improved somewhat, but not entirely...



I do not want to sound critical and maybe just a bit more information might help.
By "constant stuttering between 2000 3000 RPM" are you saying it stumbled as you would accelerate/decelerate through this range or were you trying to cruise at that RPM?
Just asking. That is a range I pass through from start and may re-enter on deceleration but would not hold constant throttle. Would feel like I was lugging the engine as being so far down on the power curve of the motor. May also be staying at or very near the open/closed throttle operation transition point with such small throttle opening making it far more of an EFI issue than for carbs.

09 America, some modifications