Ok, this is what I've ended up with. The image is just noisy as I've had to super stretch it. I do see the result of no flats in the image. I was thinking I just didn't have enough data as the histogram you can see is what it is like after doing the stretching and some levels adjusting. I've not done any other processing. That just makes it go more horrendous (if it's possible!
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And, on the off chance anyone wants to see the initial stacked image here is the link
Onedrive image link