Firstly are you sure its carb related, given the symptoms you describe I would be looking at the pickup's & Kokusans as Ped says.
If that's not it then other possibilities
Diaphragms have you checked them swapped the between carbs etc
Atomiser / emulsion tube whatever you want to call them, did you change them ? they wear oval and make fine tuning next to impossible especially with new needles
Lastly consider that those Mikuni's were notorious for having porous castings
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