I had the same issue as you describe with my 2013 EC300. Must have had that carb off 20 times and tried everything just like you. The polishing of the seat did seem to help. The final change that so far seems to have fixed the issue was another tang adjustment. It appears mine is super sensitive to adjustment. I adjusted it ever so slightly one last time and so far that was the trick. It is also possible that the move of the float valve on the tang was just not quite right. I made sure on this last attempt to make sure it moved easily on the tang. Any way probably not much help other letting you know you weren?t alone.
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