Hi Jason, I have the pioneer 108 burner. It's a good burner I really like it, but it's not very good for scanning media that's all. It's probably just the way the firmware reports what's going on with the error correction or something, I donâ€™t think it means it's a bad drive.
I, like youself, also find that with certain brands of media that the PI and PO curve look very similar, with near 100% correlation and PO being way too high. But then when I take these exact same disks (burnt on my Pioneer) and scan them in my friends liteon drive then the scans look just fine, PO is much lower. Let me emphasize that it's not a problem with how the Pioneer burns the discs, and it doesn't even seem to be a problem with how it reads then, it's a very reliable reader. It's just something about error scanning that's wonky on these drive, otherwise the performance is good IMHO.
You should see if you know someone with a liteon drive and see how the same discs scan there, just so you know that your disks are really burning ok. For all you know those discs may be just fine, you cant put too much weight on the pioneer scans.
As an example here are two scans of the same disc, burnt on my pioneer and scanned firstly on the pioneer and then on a liteon, notice how different they are. And this is not even the best example, on some media the discrepancy between the pioneer scans and the liteon scan is very much more pronounced.
Pioneer Scan http://img182.echo.cx/my.php?image=ttg0239fw.jpg
Liteon Scan http://img283.echo.cx/my.php?image=ttg0231dh.jpg