I've been levelling a 4x DK and sham team up via dungeons. Around lv73 I noticed that a dungeon clear (voa, dtk, or gundrak) was only gettting me about 10% a clear with guild perks, no rested and no boas. Was very very slow. I ended up starting a new caster team and getting the team up to 75 on rested. (stopped there since I don't need more lvls for transmute alchys.)