Thanks for the suggestion. I did the antialiased version because I need that (though in a different size) for the itch.io cover and embed images. I'll try a non-antialiased version and see how it looks. When I did that for Igor, it looked really bad and I couldn't get the amount of detail I wanted.
Just out of curiosity, are you using full screen mode? I never use full screen mode myself, as it's far too big and the text is hard to read because of the need for eye tracking over a wide distance. The image doesn't look anywhere near as bad when in a comfortably-sized window.