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For such a small amount of data this really shows how many photons get sucked up with 20" of aperture!
One thing I have learned from PixInsight is that what you select as the normalisation frame makes a difference.
When I use LinearFit I usually use Ha as the reference as it is the cleanest and has the most exposure time. This leads to very red dominant (Ha dominant) images where any of the Hb signal or reflection nebula is lost.
If I LinearFit all the frames to the Red channel however it helps preserve the correct colour balance while adding the Ha signal to the dimmest red areas.
I believe that fitting everything to Ha gives a better SNR but at the cost of colour balance.
I do a Max(Ha,R) function for creating the red channel. It adds Ha to the dim areas while keeping the bigger fatter R stars.
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