I appreciate your continued patience. Today I applied a few additional fixes, including to nginx, which were contributing to the error 500’s. The good news is that the only errors I see in the kbin app logs are related to inbound post federation from lemmy-based instances. I am sure there are many more issues to, but I’m knocking them down one at a time.
Thanks for the continued assistance!
I experience less (fewer?) 500 errors overall now. My profile now no longer does that thing at random anywhere, least. Stuff from lemmy.world tends to 500 more often, as does (for some weird reason) going to page 2 of any search result, but those are things I can def live with at the moment, I have no hurries.