I read your post but it seems like that is really only good if you have say 4-5 DK's. I have one DK that is part of my team. I am looking for a generic Castsequence macro that will allow him to do more than his pathetic 9k dps. I currently use

step 1
/castsequence Howling Blast, Howling Blast, Frost Strike, Plague Strike

I am not at home so I am sure there is something else in this macro as a fall through that I am not thinking of right now.

step 2
Obliterate

I am looking for something simple that I can macro and just let him IWT on a mob till we kill it.