It's been a few days since I wrote my original Question and since I haven't heard back from anyone, I thought I would share my findings after a great deal of experimentation.
My findings are that Windows 11 does not properly support more than two storage pools. The clear sign of this is when you are creating the third pool in Storage Spaces, you will see on the screen a message saying that Windows 11 is attempting to delete a Storage Space. This ultimately results in a failure but your Storage Space will show as having been created.
The reality is this third storage pool is in some way being confused by Windows 11 as one of the other two pools. I learned this after deleting my original Windows 10 pools (which I had upgraded to Windows 11) and recreating as Windows 11 pools. The result of doing this was the same as before. Pools would vanish, report as having drive failures/errors, etc.
I did state something incorrectly on my original post. I said everything was fine prior to the upgrade of my pools to Windows 11. This has proven to be untrue. I know that now after having to abandon recreation of my pools directly in Windows 11. My next effort was to go back to my old Windows 10 server and attempt to recreated the pools (as Windows 10 pools). I next moved each pool over to Windows 11 server (but did not upgrade them) to copy over the data from my backups. What I found was the Windows 10 pools are more stable under Windows 11 OS (at least in appearance in Storage Spaces), but as soon as you start doing read/writes to the pool, the same issues start happening.
As a result, I am now left with the only option of having two Storage Space pools and making the other two RAID - 1 Mirrors. This is far more restrictive due to the limit of two drives per array and that both drives really need to be the same capacity. Unfortunately I'm not even sure this will work as I should mention all my Pro Box drive enclosures connect to my server using USB 3.0. You can't create RAID arrays with drives connected via USB. I found a post that said you can create the RAID via SATA connection and then move the array to a USB connection and it will work. Only time will tell if that's true. I should know in the next day or so; formatting of a RAID - 1 mirror is incredibly slow! (likely 8-10 hours for two 8 TB drives).