I just tried the Pestilence Set on ptr and with the new changes i think it's capable to do the same work of the Trag'oul for pushing.
WIth changes done to 6-pieces bonus (In addition, Corpse Lance and Corpse Explosion damage is increased by 1500%.), i think it can push as high as Trag'oul and contend it the top spot.
If anyone, playing Trag'oul Set now, is willing to try Pestilence on ptr, this is the build:
You have two skills which are on two minute cooldowns. This is not good!
Also, are you not supposed to have bone spear with this build, I don't see it?