I know that part of the reason you get extra exp from a random dungeon is because you can get stuck with the rookie player. But is it not time to make a setting that is only for Sub-50 Players and make it so that until you are 50 you can't go into the CP dungeon queues?
You could even make it annoying CP free like Battlegrounds, (which I think needs the opposite, a CP level). This would keep lower level characters, whether they be new players or Alts from having to mess around with impatient or people that kick them for being to low or slow.
Thoughts?