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What temperature were you running at the sensor? I never see any FPN on my old version 1 ASI1600MM-C with everything done at -20 to-25C. Over stretching should be avoided.
Have you tried various gain settings? I would contact Sam at ZWO, as sometimes driver tweaks have been needed. There are a fair number of threads on the Net, Stargazets, CN, etc concerning this very issue. The ZWO forum suggests emailing Sam directly for assistance.
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