Thanks for all of the feedback. For now, I think I’m gonna leave Yost SEO deactivated. Over the past month or so, I noticed a number of quirky performance issues intermittently presenting, though nothing as egregious as my entire front page going blank. Since deactivating Yost SEO, all of those performance issues resolved! Everything is working as expected now.
When I have more time to fuss with things, I’ll revisit Yost SEO, but for now, I’ll leave well enough alone. Thanks again, everyone!