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Aidan, let me try some opinions.
1) Did you use dark files and bias file on stack process ?
2) your single photo with ISO 800 seems to be much noisy. Try with less ISO. 400 for example.
3)BackyearEos shows the temperature of camera. What temp it was ? Or check it when another shot.
The image of comet is very good. The guiding is very good. The color is very good. The star shape are excellent.
But ... if you are stacking in comet and star mode of DSS... wich version of DSS ? I am having problem with this option with the last version of DSS.
What about with option only stars ? There are the same scratching/banding ? And about another object DSO or star ? There are the same scratching/banding ?
For me, it seems problem of lack of dark and bias. But you must check the others possibilities. I didn't see the pattern of those scratching in single photo.
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