If all your testing and changes don't show any improvement, I suggest you try 900ml of automatic transmission fluid. It should be thin enough to mostly eliminate your clutch plate drag during normal operation.
My clutch plates will stick together if my bike is not used for a month. Once free they are back to normal. Mine are probably worn well below the factory spec, but they keep on working. The clutch drags more than I'd like but that seems to be a characteristic of wet clutches. I use Rotella T6 synthetic 0W40 diesel engine oil in the gearbox. The clutch only squawks if I'm riding a gear too high for the riding conditions. It's not loud enough to be annoying. It is however a 2011 model so it may not compare to your machine.
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2011 EC250E
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