Glad you got this fixed.
Next time, just describe your problems / symptoms better in 1st post... you could have fixed this in 1 day instead having to do so much reading on the EFI and throttle-bodies systems ;-)
Of course, I am just kidding, but your 1st post was just too vague for me to have a clue. A bit later, when you finally described the twistgrip rotation limitation (compare to another good working k1200), then it was much easier for me to give the "most probable cause".
In last 17 years, I have seen variation of this bad clamps installation many times on 3 separate forums for K1200RS-LT (and one in my own garage on a friend K1200). In one cases, I had a forum member show me a picture of his throttle-bodies from top (with air-box removed). His question was something like: "is it normal that the butterflies do not open fully vertically on the k1200RS ?" Of course it was not OK, because one clamp was jamming one of the 2 cables pulley.
I consider this as gross negligence to install fairing whithout checking all possible mechanical interference - from throttle cables to anything related that was touched or removed. This a major safety item as you create a "potential" where the throttle will not fully return close on models having only 1 throttle-cable (on these, only the TB spring can force the closing). On the 2 cables models (with cruise), you would probably override the clamp restriction / interference with hand power.
