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Tweaked pole positions a bit more, and using a more up-to-date map that includes the /inf/ island. Lemme know if that version has any errors, it's the one from the OP. I also changed it so the equator was properly at the equator, and got the cut off poles as small as I could, any smaller than that and the lands at the edges really start getting borked out.
I think I'll try to use a purely heightmap-based workflow, this way it's easier to amend and more friendly to possible collaborative efforts.