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Green and Blue are generally dimmer than red or Lum, so they need more stretching to get similar histograms. As a result, star bloom, refections and noise are much more obvious. You can push them hard and then blur filter in PS for an LRGB blend, because all the detail is in Lum. Lots of blur and level clip on RGB wont affect the final image quality much, this is a common problem.
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