I'm 22 zerker duo with 22 conjuror. We stick to blue mobs, and do quite well at it. For 2 blue ^ mobs, we usually do this. He chains one of them, then get his tank pet on the other. Conjuror keeps chaining the other guy to keep him in place and sometimes hits the guy i'm fighting with a few dot spells. Pet holds agro while I dont' use any arts to keep agro on pet. I just cast stand firm on pet to make him last longer, and hit the guy from behind. When first blue is down, we let the pet get hit the other guy . Usually he dies before the fight is over, so then I take full tanking and start using abilities to the max - easy.
With blue ^^ guys first we get the pet on him, i hit from behind with spaced out arts as to not get agro. When pet is almost dead, I turn on all defensive buffs and start dishing out full damage on the guy.
Healer would be nice to have and with one we might have been able to take white mobs, but I think with his pet we do very nicely.
Hope this helps...