Nice, I don't think I've seen a cubemap of a New Vegas environment before!
There's a program I use called CubeMapGen, it makes things a lot easier. You just have to click Save Mipchain, set the Output Cube Format to DXT1, and filter it. You can blur it too by setting the Filter Type to Gaussian. GIMP really can screw things up when trying to export them.
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There's a program I use called CubeMapGen, it makes things a lot easier. You just have to click Save Mipchain, set the Output Cube Format to DXT1, and filter it. You can blur it too by setting the Filter Type to Gaussian. GIMP really can screw things up when trying to export them.
https://gpuopen.com/archived/cubemapgen/