Brahs: leave that "320kbps" version alone.
According to my spectrograph analysis, the version first leaked is the higher quality version.
In fact, based on the spectroraphs, the quality of these songs are as follows:
320 kbps Clean leak > ~200kbps (v2) dirty leak > 320kbps dirty leak
also, the dB levels of the dirty leaks all show the recording is too loud, causing audio quality loss when compared to the clean leak.
My guess is that the 320kbps dirty leak was created by someone taking the ~200kbps dirty leak and trying to reconvert it into 320kbps, causing a loss of quality (you can't transcode mp3 to mp3 without actually losing audio quality, no matter what bitrate you'd like to attain).
in short, if you want the best audio quality, the clean leak is your best bet. if you want the best dirty version, the v2 version is best.
I can post the spectrograph and dB graphs compared to the clean version if you like. or you can take my word for it.