Hmm. Don't hate me for saying this, but I have actually spread out my exp between three different classes to slow down my leveling. I had nearly an 8 year hiatus from gaming, and I really wanted to ease back into things as I found myself leveling too quick for comfort in this game. Exp bonus food and rings have stayed in my armory for the most part.

It might be my server, but exp has been VERY easy to come by. Main story quests, your class quests, side quests, levequests, hunting logs, fates, dungeon runs, good 'ol fashioned grinding and farming in a zone, etc. I'm on level 24 with the main story quests, and I have three classes at level 26 and still have my level 3 hunting logs, Halatali and the lv 24 dungeons to wrap up, but which time, all three of these classes will be near or @lv30.

I've heard the 25-30 phase is pretty brutal exp wise, but heard things speed up again post 30.