OK. I'd double-check float heights as that will definitely cause the problems you're having.
Float heights will affect how much fuel is getting sucked up by the carbs. Too much fuel and you're too rich. That causes black plugs and poor engine performance once things warm up.
Even something like a CB350 has over 5 different carbs fitted that have different specs. The height, as Sonreir said, is specific to both the carburetor model and the bike model. Enough people get this wrong that even an otherwise good mechanic may have missed it.v
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