I fixed the blur by opening the image in another program, rotating it, and then exporting and re-registering the file in the workbench.

I've managed to fix the blur, but the contour lines are still broken. I'm really not sure what's causing it.

The image itself is generated flipped, so while yes, I can rotate it, doing so doesn't change much, since the image is still incredibly blurry.

I've gone ahead and done that, it's honestly worse haha. I've attached two versions: the first is what it looks like with my own satmap texture, the second with the WB rasterization.