[QUOTE=Albert;2697129]This just makes this particular 7200A look like a bad drive.[/QUOTE]It looks like Albert is correct. Another 7200A burns fine at 12x and 16x.
Here are the scans of burns from another 7200A at 8x, 12x, & 16x respectively when connected via a JMB36x PCIe to IDE controller.
It also looks like the 7200A and 7200S burn equivalently (at least on YUDEN T02).