Update - new LSI HBA showed up so I reinstalled TrueNAS and swapped cards after removing and replacing the thermal paste and putting a fan to the HBA to mitigate cooling issues.
Same outcome, unfortunately. I was able to get into TrueNAS and I see my pool as (exported) but when I try to import, it runs for about a minute and then resets. I can boot back to the TN environment, but no luck getting my pool imported.
I will be adding a drive or two and booting into ShredOS to work in read/write 0s, but my assumption is that all will be well at this point.
So far I have tried
Swapped HBA card
Fresh TrueNAS bare metal instance instead of Proxmox VE to rule out lack of blacklist
No change in outcome.
Only hardware stuff left is the motherboard/RAM