Try disabling the color calibration module entirely and keep using the white balance module only. As far as my experience with the GX80 and the G9 cameras goes, the color calibration module always comes with a cast, and sometimes quite an odd one.
Also, newer RW2 files enable the ability to tweak the daylight setting to your likings, like make it look warmer or colder without having to fiddle with the temperature and tint sliders.