I forgot to mention one other tuning variable...not sure if you checked the actual working fuel levels in each carb....aka "wet testing" using clear tubes...aka "clear tube method".
Though my pic taken off the bike...this can be done on the bike**, easily substituting a gravity fed fuel source to assure both unimpeded fuel levels and integrity of the float valves ability to seal properly.
** engine NOT running, not relying on vacuum petcock, hence needing the gravity fed source
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