Whatever you put as the artist name in the tracklist tab, if you ID that artist as a pre-existing one in the "add missing entities" tab, the RE not only uses that ID'd artist, but it also creates an AC "[MB artist name] as [tracklist tab's artist text]". There is no way to avoid this, other than doing a 1 by 1 lookup for each artist on the tracklist tab. (See discussion: http://chatlogs.musicbrainz.org/musicbrainz/2012/2012-08/2012-08-15.html#T22-06-14-219676 from 22:06:14 to 22:27:13)