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Something doesn’t sound right....
Admittedly, I’ve never run off a set of 900s darks, but the mean of my darks doesn’t increase that significantly with longer exposures. (And I can only speak from experience with my camera - also a 1600MM-Cool)
Maybe the 180s darks were taken at a lower offset?
Have you tried looking in the FITS header of the original dark files? In PI, open the file and then there is an option in the File menu.
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