Hey Sean
Good to hear from you.
I have to admit that I’ve never attempted to rebuild the XDCAM disk as a new volume/Meta Pro disc.
The workflow on my series is Pro Res HQ/XDCAM native. I ingested all the XDCAM material natively and left it at the 1920×1080 422 XDCAM codec. I have no real reason to conform. I use the LTO-5 purely to back up the disks in their native state which allows me to recycle the disks. I would only ever need to go back to the LTO-5 if I ever lost media or it became corrupted.
What is your current workflow/Why are you having to conform the XDCAM footage again?
Sorry I know my answer doesn’t help you, but I’d be interested to see if I could help advise you on a better workflow.