G'day youngone,
This may not necessarily be a sticking throttle, as I'm sure the dealer would have the guys in the workshop lubricate the cable or replace it - prob solved.
It sounds like the fuel injection mapping sensor/computer.
Fuel injected bikes can be moody, and the place you find this out is mid corner where you transition from throttle off to throttle on. I think all us 1300 pilots have experienced to different degrees what you are noticing.
There is a fuel injector remapping farkle you can buy/install to take the 'edge' off this - it makes fuel/power delivery a lot smoother - I'll try and find the link and post it here.
Cheers, Diesel