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No problem, just I saw a similar problem with my own flats recently and went down a rabbit hole trying to work out why something I had nailed a year ago was suddenly giving me grief.
I use my 2600MC exclusively on 0 gain, and the MM on 0 gain for LRGB and 100 gain only for narrowband, I did shoot NB flats at 100 gain but a rough and ready set of sky flats this afternoon at 0 gain did better than a properly done set at 100 gain! I think it comes down to the loss of resolution where 1e=4ADC or so, the quantisation error was just too much for it to work.
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