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I bought a 911 with a related issue. I had a butterfly alignment issue on a set of Zeniths that caused difficulty in getting a consistent idle. I took them off loosened the shaft connecting couplers and aligned the all three butterflies with the first idle circuit hole in the throttle and retightened the coupler. That solved the whole problem and the carbs no longer needed any air by pass at all. The synchronization was now only between the two banks. The carbs worked better throughout the idle circuit after that.
Webers only have one coupler per carb so only one butterfly can be out of sync with the other two. Still, this could be part of the problem.
Good luck.
Chad
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