is this normalFollow

After respeccing my mutilate to follow (somewhat) nooble's suggested multilate build I had a few puzzling runs. (I was originally mutilate/sub (50-60) then respeced to combat which.. I personally found uncomfortable though I was ok leveling combat from 10-50.)

I ran SL(normal) with a few guildies and half asleep a while back. got most of the damage on my rogue and was thinking wtf the entire run as I knew I was missing half the timing on my rotations in addition with positioning issues.

I was under the impression that the gear he had would have given the mage +450-600 damage which I believe would put him on equal footing with me. End of it, the mage was 32 while I was 38 (from dying 1 min out of 5 into murmur. rather than 31% and 39/40%) I was really depressed to be topping the dps when I was only doing maybe 80-90% of my potential dps from nodding off every now and then. (and yes the meter counted the extra pet damage they had to call up every now and then) is there something to be said about my gear/spec or is there something wrong with the guidie dps/ spell rotation for me to be leading by that high a margin? the next few instances I went with pugs were more normal with total damage dealt ranging from 33-37%

basically is the problem something I'm imagining or is it the guildie?

http://wowarmory.com/character-sheet.xml?r=Frostmourne&n=Adderstrike