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Lots of 'modern fuels' leave a coating like that ...some more, others less. They make it harder to read plugs than in the leaded days.
I'd go with what you have, looks like you are getting more oil in that chamber than the others but it is far from fouled.
As the T Doc says you are reading your idle presently, the only way to read a plug is as he described...at load then engine off.
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