If you are getting consistent gradients, then I personally suspect the flat light panel if you are using one. The one thing about Galaxies is there is a lot fewer photons available to capture.
I found that using my Flat panel using an EL switch-mode power panel light, created interference patterns. Currently, now I am simply taking images of the dawn or dusk blue sky directly. Improvement is better for me. I still have an interference issue with the camera itself but that is an earth-loop issue that creates bars across the image.
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