Hmmm, well the burst rate checks out, that’s good
It looks like you have the Intel RAID drivers installed, and perhaps the drives don’t like that.
Cressida or Albert are good at those sorts of things, so hopefully they’ll come along and advise further on that.
Copying on the fly (directly from drive to drive), especially at the full 16x, is something I wouldn’t recommend. Have you tried copying to the hard drive first, then burning at say 8x?
If that causes a problem, then I’d say it’s possible the problem lies with the Intel RAID driver.