well for starters, if you're going to try to do a lot of aoe on immerseus like that, you should start one cast pre-lunar and use no cds on the pull. By the time the adds spawn you'll be in solar and use all your cds, dot the boss, dot an add or too as it goes in, shrooms, hurricane. Ask DK before the fight where he's aoe gripping to, maybe try to track his location for it.
CD usage on Nazgrim should be everything on pull, then save your 3min for the 2nd berserker stance. then last one should be up for that lust you guys do at the end.
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and just looking at like 3-4 fights so far I've already found 2-3 encounters that are 6+ minutes where you only used 1 or 2 or even no CDs unless this log is bugged.
http://www.warcraftlogs.com/reports/...=58&options=16