If you take a set of "dark frames" (with identical exposure settings to your "light frames" - i.e. actual photos) and import them into DSS along with your light frames, then you don't need to use the in camera noise reduction features. You can use the time you save to take more subs.
As for problems getting detail, perhaps you could post a few examples of your unprocessed frames straight out of camera, and the DSS output image you get?
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