The server is still seriously unstable :/ Crashes like every 30 seconds, and always gets back up 5 seconds later.
Edit: It doesn't appear to be crashing when I'm not logged in. I may have a theory: Something, no idea what, in the world, is triggering a bug that makes it crash. So I went to spawn in attempt to prove this - if there is some mob or block making it crash, unloading these chunks by leaving em should prevent it, at least for a time.
Edit 2: AltusClara thinks he found the cause, near my house are a whopping 700 entities in a very small space. The owner of the plot is delusion_hunter but I don't think he/she has any malicious intent with these density mob farms.