Definitely some improvements there, Dunk, even if not perfect.
Wrt the "magic" number, there is but it requires a lot of analysis to figure out. For my KAF-16803 camera, I need to collect about half a million electrons, which is about 12 flats at around 30,000 ADU. For a camera with shallower well depth it's likely to be somewhere between 20 to 50 flats. Get as many as you can...
Cheers,
Rick.
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