Carbon cans = low idle??

Fitted a couple of carbon cans onto my bike this morning, and whilst out taking it for a run, found that it seems to idle lower than before. It used to idle around about 700rpm (lower than normal apparently, but I was happy with this), but now barely reaches 500rpm when warm. The engine temp got upto around 65C, well above when i normally put the fast idle lever fully back.

I heard somewhere that the 620ie has a pretty flexible management chip as standard, so is it just the really cold weather at the moment, or is it the newer cans? And if its just a case of upping the idle speed, how do I do that? is it just a simple thing to do or is it one of those 'plug the laptop in' jobbies? I'm pretty competent mechanicaly and know how to set up carbs etc, just need to know what to adjust

Cheers

Dark-Jon