That you got anything at all from the 'burbs is a miracle. So tempting to stick with narrowband and bright emission nebulae, or bright things like globular and open clusters, but galaxies can be exquisite.
Your 15 minute 2x2 approach is working far better than with the 2 minute subs on NGC 253, so you're racing in the right direction.
Still too red. Understand that light pollution makes it virtually impossible to get right, but this galaxy is notoriously blue.
Absolutely definitely add another night or two of data. Worth the effort.
Very best,
Mike and Trish
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