Most folks will probably recommend a smaller pilot. Try a 42, it seems to be commonly recommended. Have you done a compression test? It should be 180-190psi. Have you checked the squish? Ideally you want it to be 1.3-1.4mm and this may require machining of the cylinder head to correct.
Your bike is old enough there may be some wear on the needle jet. A number 5 slide is on the rich side, but the slide cutaway does not control idling.
I've never been happy with the idle on mine. As long as it can mostly idle, that's all I need. I'm also getting something of a hanging idle, but it's more of a nuisance than a problem.
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2011 EC250E
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