BTW, when I say 'skybox' I mean a spherical mesh with Material that wraps an equirectangular image; 3.6 doesn't have Skyboxes.
I have a custom Shader that allows me to stack
I'm using JPEGs (imported Lossless in Godot) and this post is based on viewing those.
Also tested the deBanding option in Godot.
I edited side-by-side screengrabs and brightened the visibility.
The Godot images clearly has banding compared to Krita on the right.

(In a similar vein, the same image (equirectangular wrapped onto a sphere in the 3D view) is HORRIBLY degraded in the editor viewport and I can't find a Quality setting)
Is there any hope for me? I can't find anything else I can adjust.

    kuligs2
    thanks for the reply! Unfortunately that info is pretty basic and keep changing the settings without success. It LOOKS like some kind of compression but I can't find where that might be occurring.

      SOLVED!:
      Of course the answer is in the basic docs. I can never seem to read the docs carefully enough.
      Anyway, GLES3 Debanding ONLY works if the HDR option is set. I'm not using any HDR assets so I didn't bother turning on.
      I am so happy now! Hope this helps somebody else in the future long after I'm gone lol.