I have taken Russell's advice and played around with the DSS star detection threshold and managed to get a stack of eight subs (2080" of total time). It's actually looking much better, once stacked and with just auto leveling done in Photoshop. Please ignore the star shapes as noted before I know there are issues there.
Image is reduced jpg below, posted next to the unprocessed Newt single sub of 255" as an example for comparison - so about an 8:1 ratio there.
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