Recently I have been encoding my CDs with oggenc -q2 found it crappy tried -q3.
Then I remembered the listening test in which a modified libvorbis won first place.
Apparently it was tweaked for <=-q4 so I thought I was using -q2 -q3 why not try it out.
Compared my old -q3 encodes with aotuv -q3 encodes. The tweaked libvorbis/oggenc produces smaller sizes plus better quality. what a treat!

Vorbis aoTuV is the total winner of the Multiformat at 128kbps public
Listening Test below:  

libvorbis patch for *nix :

win32 binaries:

Use of bitrate management mode is not recommended.