Hi Pietro,Iam dont know what to say in reply to this,however if I dont let my engine get hot before ridding off first I too can get Icing.
I have had this problem many years ago on a Kawasaki GPZ 600R,Kawasaki got around this problem by fitting new carbs with heated float bowls ! It works and they still use this system on todays bikes.
My dealer tells me he blames todays modern fuels,but I have tried all types of petrol and it makes no difference.Have you tried raising the needles in the carbs as well ?
I will keep you posted if my icing returns.
I have some 30,000Kms on mine now.