That farmer/harvester was a very strong/clean setup with locally attached 500TB disk space. For whatever reason, Chia node couldn’t handle that load. Changing to Flex fixed the problem. And no, that was not dust storm related.
I would assume that with that amount of disk space you will be doing self-pooling, as such may not have the same feedback as pools provide (e.g., everything looks cool locally, still no wins).
Still, it would be nice to see, how much you can push it.