this is how i usually break down a df run:
1. check the jobs/gear of the classes i have queued up with. if i get an ideal set (blm/bard/whm, everyone has relic) i ask if they want a speedrun.
2. if this is not the case, the first section is split into 3 groups. the first is to the stairs, the second is the big room and small hall, and the third is to the door. kill tonberry, run through door, kill everyone else (or pull boss if there is a bard/i'm feeling bold.)
2. second section i go slow, 2 pulls for the first hallway, 3 for the main room. kill everything.
3. last is split into two as well. first is the bogys/tonberries, then its to the door.

i have whm leveled to 40 and bard with relic (coil-ready, though not my main). i would like to say that i know WP very well...i also rotate coolowns while doing this, its pretty rare for me to die.