When doing your colour balance in PixInsight for narrowband I find it best to turn for Structure Detect, this will stop it from trying to white balance on the stars.
I find that the white balance is best done once all of the stars are removed as the stars throw it off. As removing stars can be a painful process JUST to get a better balance, selecting a large nebulise area with very little stars or at least no big bright ones will give you a better balance.
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