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I don't know if this is still relevant since you took the bike to a shop, but I had a similar problem with mine and corrected it by turning the PMS screws about 1 turn further out (3 turns out of the seated position in total in my case). When the carbs are synchronized, clean and all the other stuff you've already checked too - try to get a stabile idle adjusting the PMS.
Didn't try that. Wish I had might have saved me some cash.
Thanks for the reply
I'm pretty sure this could help in your case, sorry that my message came too late, but write here anyways about the outcome from the shop...