**** UPDATE ****
I found that there was a new FIRMWARE update for the HP 331T-Quad card, and I applied it. It is like 2 versions higher now than where it was.
Did a brand new install of Proxmox, and enabled the IOMMU settings.
Still seeing the PCI Bus errors, and found an article to add 'pci=nommconf' to the loader.conf section.
Been running more than 2 hours - no PCI Bus errors.
So I built a new pfSense VM and added the PCI directly for 0000:01:00.0 and 0000:01:00.1 as two NICs to the VM (direct access not virtualized ports).
Software installs - but only one Interface is seen (not 2)....and just repeated errors about a Firmware Link - over and over and over.
Oh Well - according to UPS, my INTEL i5-T4V2 card should be here tomorrow.