Hi Peter,
My commiserations on all the issues you have faced but the final outcome is impressive!
I downloaded a copy of the image from Astrobin and it doesn't contain an ICC colour profile. That may be the cause of some of your colour inconsistencies. Astrobin used to strip ICC Profiles but that was fixed some time ago. IIRC, PixInsight doesn't know how to embed an ICC profile in a PNG file so if you want to use PNG format you might need to fix that with Photoshop.
Cheers,
Rick.
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