"With the idle mixture screws completely closed it still ran rich and not as you are all describing it should".
With idle screws closed it should not run at all. Along with some of your other symptoms ...a clear indication of unmetered fuel bypassing normal circuits and entering the venturi.
If jets are not monster oversized, I'd be willing to submit a float valve control issue exists. Fuel levels are begging to be checked via "clear tube" method.
(they can be out of spec and still not visibly leak all over the floor, for example )
Didn't I read on the internet "carbs are easy"? Right, sure they are. Precision little boogers....lotta various stuff goin' on inside there.
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