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Its been a while since I have "played" with Webers but I know that on some race applications you can run into a fuel supply issue. On three barrel models one float provides fuel for two barrels and the other a single barrel. I have seen the side that feeds two cylinders run low on fuel under extreme loads. Perhaps the opposite is happening where your single feed float is over supplying that one cylinder. These carbs can be converted to a return style system with out a float or a balance port can be created between the float chambers to share fuel availabilty evenly, either will help retify the issue. Both of these mods are a bit to involved to discuss here.
By the look of your jet stack it appears the main jet is now on the bottom instad of on the holder in the side of the carb as it is stock. On the cylinder running rich, if it is supplied by the one float chamber try droping one main jet size and see if it helps. I would make sure all other factors are emininated first before blaming the carb. Flattening cam lobe, burned valve/seat, weak valve spring, excessive leak down, igntion problem etc.. Best of luck.
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