I'm going to bet that you guys are "doing something wrong," in the sense that maybe you're missing procs/buffs/debuffs etc. I don't say that to sound mean at all, and I'm not saying you're bad, I'm just assuming there are more factors at play here other than "I'm doing everything this person is doing, why are they out dpsing me." I would suggest three things. First, post a link to a log where the same class is out dpsing you. Second, link your armory, and lastly, I would suggest downloading a simcraft to sim you're toon and see what it says your dps should be. Also, I'm not sure about dps/healing, but AMR isn't very reliable for tanks, and possibly the other classes, as it places too much weight on certain stats unless you go in and literally say I want x stats.