Here's the thing. I had a SOHW-1633S BS0K. Burnt many discs with it. Used Kprobe2 to do scans at 4x, and also Nero's CD-DVD Speed disc quality test. The scans were very similar in both programs. Basically with my spindle of Sony 8x DVD-R's, I'd get PI max around 100 or so, and PIF max around 2 or 3. Generally quite good, but the PI's would be higher at the beginning (sometimes over 100) but then stabilize around 20 to 40ish.
So I swapped the 1633s with a new 1673S, flashed firmware to JS05. But now my Kprobe scans show much lower PI's, like max 50 to 60, and sometimes the PIFs are higher, like average 1 to 2 but then a spike of up to 4 or 5.
Is the 1673S that much better, or is it the firmware, or what? I didn't expect the drive to be much different from the 1633S.