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I don't use DSS, but have tried it here and there. I would try longer exposures to the limit of your equipment and see how that goes. Perhaps there isn't the signal in each sub exposure for DSS to work with. Can you post a sub to get some idea of what you are dealing with?
Exposure time in the burbs is usually around 3 minutes with a DSLR, but I see that you are using an ATIK (OSC?). The limit is the point at which detail is obliterated by the bright sky. Perhaps that's why your galaxy looks good at 30 seconds.
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