Re-did it with DVD fab...no problems.
I only do file structure because I have to split the files, as I used a FAT32 drive. I'd use NTFS but as a Mac user, that introduces a lot of pains in the ass.
I really wish the Oppo would read Mac journaled disc formatting, or that OS X would have native NTFS support. I'd still not go back to Windows if you paid me though. :)
As for the audio, I'll have to do a better test, but I had to crank my fader more than when using the LaserDisc. Was anything changed?