Increasing xp gained by dps classes in leveling dungeons

[FaileExperiment]

What about individually increasing the bonus XP/tomes awarded at the end of a dungeon run, based on how long you were in the queue? Up to a predetermined maximum to keep things from getting ridiculous. The idea being that a dps who spends 25m in the queue vs. a tank who spends 30s, end up with roughly the same about of tomes/xp per hour, assuming they queued continually.

But either way it wouldn't be based on role, but queue time.