I can assure you that a blitzer dosn't need blitz to kill trash ee bosses in no time. As for orange names, they just get stunned and mortal feared. DI sorcs get working necro on top of their uber dps in easy stuff. Shiradi still has joy, it's out of this word regardless of content. Monkchers are still boring as hell even if the content is easy. And they still run way faster than you. Run speed and dps don't change even if the content is easier.
The game is completely unbalanced, and the difficulty of the quests you run has nothing to do with it. I wish this thread popped up before I tred out of blitz, because I can barely compete now (still holding one record though... until someone bothers to beat it - shouldn't be hard), it sucks, but that's how it is.