Oh when you're using AstraImage, when you recombine the separate RGB images, use the "Relative Intensity" box to change the colour weights.
For example, on the 2nd image you could've set the red weight to "1.1" or "1.2", and then click "Update" to see the preview. You can see it will have less red. You can then do more adjustments using the colour balance sliders after.
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