Death Knight Should I match sockets as a dk tank or just go all mastery?

I'm gearing up my dk because I'm bored of my pally, bear and war tanks. He's sitting at 353 eilvl and 359 ilvl. Ran End Time for the first time on him and healer said I was fine, but I noticed he was ooming every fight. Not sure if that was me or him. I was averaging around 4-6k hps every fight. For DK tanks, it's best to save a DS for a big attack correct? Say on the final boss in End Time, after a breath the dragon does or something DS right? That the general idea of ...

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