I'm surprised no one mentioned it yet, but it was about GSM desynth ~70 where I started doing a lot of Frontlines to get PvP accessories to desynth. Between 1-3 games and you'll get a piece without pesky RNG playing a roll on claiming darklight drops. Good Myth/Sold (Sold/Poet now I suppose) for the effort, too. This was before Rimless Glasses came out, however, so if Garlean drops are cheap on your server (are they on anyone's??) I'd go that route.