Dont use wild magic sw
its useless and keeping dots rolling on putri is more meter whoring then actualy helping your guild in the encounter.
with the 15% buff available to you, your prolly gonna stall putricide in p1, and get an extra ooze to save up energy on the abomination. the transitions are crucial, you want to have as many people stacking up on the green ooze (including pets and 1x army of the dead) the other dk's pop armies in p2-p3 transition. (and make sure their armies target the g reen ooze <_<)
keep your infight pot for P3, or if your still progressing on transition phase, pop it durring those.
you DONT wanna get hit by goo, but thats ofc normal..
if you want to realy max your dps on the meters, then yes dot away on putricide and meterwhore are you want. but if you have a decent guild i would say they do not like meterwh0ring.