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You may need to blend more Ha into the red channel Ken. The Ha details appear a little muted. The latest revision seems to have brought a little more colour back into the stars.
You can also trying the luminance layering technique by adding the Ha image as a luminance layer to the RGB, but only at 50 or 60 percent. Then flatten the image (which creates a super RGB) and add the same Ha data as a luminance layer again, but this time at 100 percent to get as much detail as possible. May need to boost saturation as you go with either shadow/highlights or saturation. Note, shadow highlights performs a non-linear stretch on the data whereas saturation is linear (the equivalent of levels). Keep this in mind so you know what you are doing to the image. Excessive use of saturation will excessively lower the white point introducing star wash etc.
Keep at it. Don't be afraid of experimenting to see what works well. Every image is different.
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