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Peter,
ah, the in camera noise reduction could be the issue then, I mean, you have already subtracted a dark. Does this mean you did darks as well, and fed them through DSS, or not? In camera works, but you effectively spend half your time taking darks, something that you will soon tire of.Maybe try a light pollution filter as well, possibly see if you can "borrow" one from someone, it may be the life saver you need.
Don't panic about the un-modded DSLR, I'm in the same boat, use what you have, and the rest can come later.
Gary
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