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Hi Grant,
I have used DSS a few times, and also had problems with it not finding enough stars to stack. It seems the program is just not suited to long f.l. setups.
If you are wanting to stick to free software, one alternative I have used is a package called ImageJ. There are some astronomy plugins which allow you to align and combine stacks. Not as sophisticated as DSS in terms of pixel rejection, but I'm sure it would give you a decent result given the sub you have shown.
-Ivan
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