I see! So Finder is the problem? I saw it in the preview (use the tab to preview a file), but it also turned up in Font Book, so the preview was correct.
I deleted all the font caches with your method above. I exported the font again and dumped it on the websites mentioned above. This seemed to work well. The output now looks great. And I even get way more information than I got before. So fantastic.
I even found a very interesting way of testing font files in NON-ADOBE or NON-APPLE apps like Affinity Publisher. I’ll describe it in my forum post with that question:
It requires the use of Eagle app, but it works awesome. It seems to avoid font cache issues completely.