Well done Bo you have some nice data there. I wish I could get that.
Some extra steps I have tried that seem to help. In Registax do an RGB align. I expanded the box around the planet and then hit estimate. This gets rid of the red (top) and blue (bottom) fringes.
Then open the histogram and select the blue channel, move the left slider up a little and hit stretch. This gets the sky background black.
Try it on your original you should get a better result.
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