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Your focus doesn't look bad at all, but hard to tell at small web sizes. Not that focus seems to be a big issue for you going by the image but if you are uncertain about focus, and if you don't have an EAF, make sure you are using a Bahtinov mask which will make focusing very easy, even manually. Focus can shift as the temperature drops particularly if your OTA was not equalised with the ambient temp when you focused it so check your focus periodically in the night particularly after a big temperature drop.
The underlying data quality looks pretty good, as others mentioned once you fix your star elongation issues, you will be able to get some good data and can then work on your processing.
In answer to your original question though, more detail comes with more integration! And a big part is processing/stretching too, coaxing the detail out of your integrations is also important.
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