When you check you float level it is recommended that you do it with the carb full assebled using the silicon tube connected to the tit on the carb sump bowl and bent back up with the drain screw fully open; rather than a manual check with the bowl off and the carb inverted as the specific densities of the floats can vary and hence how high they will ride above the fuel line. It sounds suspiciously here that one of the floats has some fuel ingress raising it's specific density allowing for a change in the level that it will float compared to it's twin. Hence why you may find a higher float level on one side when you lean compared to the other. With the carb off and the catb level check the float level. Then lean the carb one way and check the float level. Then lean the other way and check the float level. If all three are not the same, change the floats.
Fuel mixture is more critical when the engine is cold. This is exacerbated when the vaporised fuel starts to condence before the ignition sequence.
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