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Personally I think a hokey linkage adjusted by bending is a big culprit for poor results as the carbs are simply not actuated simultaneously.
Good advice. The C-W carbs linkage set sold by Langdon's is excellent.

His photo of the installed linkage is odd, but it is not hard to figure out how to use/install his linkage set (if you use it, ask here about an adjustable up-rod from the bell-crank on the block to the linkage).