It wasn't ever an issue of power or corruption. It was hitting the rewrite limit of the SD card itself. I had it on a UPS with my other network equipment and maintained a 100% uptime other than intentional outages with clean reboots. Literally wrote so much log info the card would die. You could still read the card but writing would no longer function.

The suggestion to do a read-only setup would be optimal, I'd prefer it be ram based though as I wouldn't have such dire need of logs that losing them during a power cycle would cause me any grief.