If the temperature has 'always' been there but you hadn't really noticed it before, then I reckon the in-line stat isn't the recommended type. It needs to be water-tight when closed otherwise the bleed-by will lmit what temperature the engine will attain. I'd suggest replacing it with one made by First Line, Gates or Mahler. These have been shown to perform best because there's little if any bleed-by.
TC
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