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You have made a good summary.
I have a few comments.
I live at 1100m altitude in dark rural site. Getting better than 2arcsec seeing is rare for me. It does occur but not often. 3 is the norm.
Galaxies are little objects and most are relatively dim. You are using a short focal length resulting in a small image size and compensating for this by using small pixels.
There is a reason that pro telescopes are big. They collect more actual photons and have a higher resolution. A larger diameter scope and larger pixels collects more photons for the same image scale.
The short focal length refractor is best at wide field imaging.
I think hunting for increased resolution and hence higher magnification with little pixels is not the best way to go. A bigger scope is needed.
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