Try star tools for processing, it's free to use. The only downfall is you can't save the image, I used it quite a few times before I bought it to be sure. But what you can do is take a screen shot with your laptop ( snip it i think it's called on windows ).
https://astro.ecuadors.net/processin...ith-startools/
I started by using the work flow described in the link pretty much how it is written there, not sure if my original shots are still here.
Did you use dark shots as well?
I'm on my mobile and can't fully remember my settings for DSS atm, the settings now are working really well.
Dont forget to use one shot as a reference frame for DSS as it'll use that as a basis for the rest of the subs.
When I get onto my lappy I'll give ya more info.
Cheers
Karl
Any Q's dont hesitate to ask or pm 👍🏼