Hi all,
Just wanted to report back that I found time to do more diagnostics. ZFS/FreeBSD/etc are not to blame. ZFS / FreeBSD never reported any I/O errors and scrubs always came up clean because one of the disks was failing and had issues reading the disk but would eventually return accurate data. It was sort of like having a RAIDZ with one disk that had 30s latency sometimes! Seatools confirmed this disk was failing and after replacing the disk all issues went away.
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