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It looks to me like detail is preserved in areas where there is less field rotation or less data (the centre, east/west ecliptic and the edges with less stacked frames). This leads me to believe that DSS is overcompensating for field rotation (presuming you're using an Alt-Az mount?)
Depending on how many frames you stacked I'd try doing them in batches of 5. I've only used DSS a few times so I can't remember if there's a specific setting for field rotation compensation?
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