/em cracks his knuckles.

My Warlock has 1150 shadow damage with his Darkmoon trinket cranked up. The best spec that I've found for farming Cath and ZF is a modified SL/SL spec--Make a macro that reads like this:

/castsequence Siphon Life, Curse of Agony

/petattack [target=Greater Healing Ward V]

/petattack [target=Magma Totem]

I'm not 100% positive if that's the exact wording but you get the idea. I use my Succy. Basically, you double dot everything with Siphon Life and Curse of Agony and every time you hit the button your pet will nuke any totems that are out. Those healing wards are the one thing that'll force you to triple dot, so that's why you have that in there.

For me, with that much shadow damage I was making 45 minutes a level from 35 to 45. The area with the zombie graves is crazy xp