FFS...

Your original post was a 'beat this' one. I did. End of story.

AFAIK instance boosting is the quickest way to do it, but you CANNOT instance boost with a lvl 50 paladin, he won't clear it fast enough to make it worth your time.

The reason you're losing out on exp and taking so long to level is not because you're playing too many toons, it's because you have no knowledge of how to play.

You're an amateur trying to compete with professionals and so far they've been indulgent of your 'eccentricities', this won't last, especially if you do something dumb that brings us all into disrepute - like being too knowledgeable about [program that must not be named] for someone who doesn't do [activity that must not be mentioned].

TLDR summary: LRN2PLAY!