kiwi dave
GT Reference
Thanks to everyone here for their assistance on this long journey. For the time being, unfortunately, it has to end here.
No, you've balanced your throttle bodies, but the high idle is due to the stepper motor being over zealous. Some do, some don't.
As Brian UK sez above, insert a pnuematic (air) switch in the hose between the air box and the stepper motor. I have three 1200 Sports with these installed. Once you get the motor warmed up, you can switch it off so the hose is blocked. If you want to simulate this result, simply squeeze the hose with a pair of pliers and watch the revs drop.
An added bonus is the increased engine braking you will experience and enjoy.