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Hi Matt,
As I mentioned to Dave in the tips and processing sub-forum, think of a flat dark as a dark frame for your flat (light) frame. If you haven't already taken them, and, I know this is heresy, because this all should be done at the same time as the image (lights and/or flats were taken) but, would you be able to take a bunch, say 19 or so dark frames for your flat frames? Essentially, if your flat frames were 1/250th (or whatever your exposure duration was) of a second at ISO-100, put your lens cap on, make sure the viewfinder is covered so no stray light is entering the camera, and take 19 exposures at 1/250th (or whatever) of a second. Essentially, the images will look black. That's what we want.
If you can do the flat darks for me as described above, and, if all your stuff was shot in RAW, I would love to have a go with your data as I can tell you've captured some amazing stuff there.
Unfortunately, I am unfamiliar with DSS so will be of no help there at all.
I'll message you my address.
Regards,
Humayun
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