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The Helix is dim and you have pulled out a lot of detail. But as Kevin says 20hr should be a lot less noisy. Taking note of another thread - I don't want to start giving misguided advice, and trying to process jpgs is not a great idea (I think), but a few things
- You say you rejected anything with FWHM < 3. Is that right? Wouldn't you reject FWHM values that were too large.
- The uneven background could be light pollution, or light coming into the scope somewhere.
- What do your flats look like as there a dust/water droplet like blob.
- Maybe you could just stack the more recent data where you say you got better at it.
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