To the OP: I agree with what most of these peeps are saying, excluding Marco, no offense meant to him.
Now, to avoid making another thread, if I can hijack this one without offending the OP that'd be great. My guild is close to a H lei shen kill (3% wipe), so we're going to be pushing it this next week, but our prot pally will be missing all week. And sense I'm the other main tank of the guild, I'm trying to increase my dps so that I'm not as far behind him as I have been, I feel out monk might not be up for main tanking, as it's his off spec, and it would require him changing the way he's playing completely. I've tried reforging for mastery > hit 7.5 > expertise 7.5 > haste. But I only got to 3.7k haste with that reforging. And then trying a Mastery (17000 unbuffed) > hit 7.5 > expertise 7.5 > haste but only got up to 4.7k. So I'm looking for input from well progressed dks on how to improve my dps, and where they have felt comfortable with mastery in a 25 man heroic progression guild.
My armory. http://us.battle.net/wow/en/character/mannoroth/Ravendare/advanced
Other trinkets I have, soul barrier, LFR feather, LFR primordius. (My guild has had horrid luck with strength dps trinkets.) I also have some off spec heroic pieces that I've collect, tidal force treads, and horridon bracers namely.