Heya,
Everything I found indicates that it's only these 4 clamps on our bikes (R6 as well), I've seen some pics and the rubber "boots" for each TB are rather deep, I guess it just needs more rocking/force. The fuel rail is attached to the TBs, but doesn't look like it's stopping from lifting them up..
The left side has the throttle cable which will limit full removal, on the right's there's TPS which I want to test using a multimeter, also, I'm due my valve checks which mandates TB removal, but I've read some members stating that you don't need to fully remove them, pushing aside is enough to get to valve cover.
Come to think of it, I think them being stuck saved my butt, cause there's lots of dirt pilled up at TB connection points, I ought to clean that out first and give pulling another go, most likely this weekend,
Thanks!