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Just looking at your attached images there and noted you are using gain 100, I never use that for flats as I found it produced flats which corrected quite poorly. At gain 100, each electron is about 5 ADU and I found the result to look quite posterised when applied to lights and integrated.
I always do my flats at gain 0 with my 2600 cams (Both mono and OSC) and I don't aim for a specific AUD, just somewhere in the 20,000-30,000 range, so long as nothing is down near zero and nothing near saturated.
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