I hit 50 and skipped a ton of lvl 35-40 quests and most the lvl 40-50 quests -.-, do you make an effort to hit up all the fates in the area while your questing? I even still had lotta story line quests to finish after hitting 50. Dunno what I did I always had more quests then I knew what to do with only thing I did was run to every fate I saw pop while doing quests...

Also I got amost an entire level doing exploring and unlocking all the areas of the map 46.25-47.10% or so. Hunting quest I finished all those as well.