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Just one other comment, consider alignment, did you use plate solving to get back to exactly the same place, or do you have offsets? DSS will normally work the registration off the sub with the best signal, and register the others against that. If your location is off between the two nights you may get some rotation or offset on the final stack which can expose gaps thst need to be cropped out. You can use a Group function in DSS as well.
As to the 300 sec group, the same comments apply regarding precise location. I would be tempted to use them as a separate layer in Photoshop.
Btw, have you graded those subs? I always use Image Grader to identify the outlier subs that should be discarded.
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