We may need to think separately about UX and Design just for this time.
Dark themes are usually considered more elegant, sober, serious, sometimes it is even related to luxury than any other colour. This is, of course, a social convention such as red for violence and orange for activity.
So it is quite hard to make a generalization. I think it depends a lot on what your site is about and what it wants to inspire in the user.
I don't feel like there is anything to make you change your mind about. It is a matter of personal preferences. I am currently using the dark theme as well. I feel like it puts a lot more emphasis in the content than any other. But I keep changing it all the time. Light theme allows me a more relaxed reading.
However, in general terms, I always prefer long reads with a light background.
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