I'd say if you cant find a good replacement on the mac side just yet, perhaps install a small bootcamp partition or run Fusion or Parallels and stick to what you had before if thats possible?
I personally just use iTunes and edit by hand in each directory.
It takes longer but I get what exactly I want.
I used Tagr and other apps like that to only run into other problems;
when opening in itunes the tracks wouldnt be organized instead track 1 of 10 itd be track 1 of blank and it would generally change the genre and other small discrepancies so i just stuck with the tried and true of hand done.
obviously youre not looking for that but maybe go back to your other program with the initial suggestion?