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Are you certain the fuel is fresh? Is the tank perfectly clean? Any bad gas in the tank will continue to give you problems even if you add fresh gas on top of it. You may need to completely drain the tank and floatbowls to be sure.
Have you checked for vacuum leaks? Some of your symptoms suggest there may be one.
If everything else checks out, the only thing I would adjust on the carbs would be the idle mixture. Make a note of where they are now before making adjustments, but I wouldn't hesitate to see if that may cure the issues.
Checking the carb sync with vacuum gauges would be a good idea, but most likely they are close. If not, there may be other issues contributing to the problems.
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