OK, here are some results of testing with KProbe 1.1.10 on my LTR-32123S with FW XS0Z. Both discs were burned on the PCRW1208 from a 74-min ISO image.
The disc with which I tried to packet write:
C1 Max = 3587, Total = 7401755, Average = 2001.015
C2 Max = 19, Total = 1817, Average = 0.491
A terrible result; no wonder the drive slowed down so much in the verification stage when packet writing!
A new disc from the same package:
C1 Max = 71, Total = 54581, Average = 13.316
C2 Max = 0, Total = 0, Average = 0.000
A much better result, but far from wonderful.
I'll try some software compatibilty tests later. Thanks for the help and interest, TheWizard.