I read the first 3 pages of this resurrected thread, and skimmed the rest to the end.
We know that same-model bikes will have somewhat different characteristics, but usually in more minor, or subtle points, like where the friction zone is, and such as that. I've owned FI as well as carburetor bikes, and for 14 years my KTM 950 was carb'd, and in all likelihood it still is.
Moving to the '08 1300 was no problem at all, aside from getting used to 200 extra pounds.
My 1300 throttle has never given me any grief, although there IS a degree of driveline snatch, which is easily dealt with, but this has been present with EVERY bike I've ever owned.
I doubt I could explain it any better, as well as how to mitigate it, than has
@jfheath in the first couple of pages in this thread.
I don't deny it exists or frustrates the OP, but I haven't noticed any lag at launch, or stumbling, all the way through the gears. And sometimes I'm fairly assertive with my starts, and I enjoy the way this big fat pig can get its legs under it, and hustle off the start line.
While heavy, it is no slouch if you wanna be quick.