Our dk tank was away last night as well so, I had to step up to the plate with the kiting. To be 100% honest, my guys actually prefer kiting rather then healing a dk through it. I think that this is good with the impending dk nerf (although it may not even be relevant with the scheduled release date of 3.2). If you feel like trying the kiting move again, what I suggest (at least for 25 man) is a north/south or east/west kite pattern in the room. I usually run wall to wall during the Surge of Darkness event. Once I get to the wall, I wait for him to get to me, sometimes charging back to interrupt the aoe move if the rogues are on the run, and then spin him around for the next Surge of Darkness. Healers try to remain in the center of the room as much as possible. I also recommend Tuskar's as the minor run speed increase is more valuable then the loss of the 10 extra stam from major stam to boots.
Execute for show, tank for dough.