I need to put in some serious time in LFR or something to see why I seem to be hitting a hard ceiling on my assassination rogue's DPS during Imperator attempts. Time off target is my biggest enemy but there's a ret at my ilvl nearly doubling me up on every pull so I wonder what the hell is wrong. It feels like my tools are just wrong, or maybe I'm just at that point of inflection where a secondary stat is wavering between amazing and crap and I just need that one upgrade or something.
compare your dps to your spec, not another class. Just look through logs and youll find the answer.