Double ray of enfeeble, and then Ice Knife with combat advantage and no chill on the target. My record is 30k in PvE and a 24k in PvP. Scoured from the earth is a good way to describe the usual results.
Its odd. I did some testing, and normally swapping it in and out there is no change in damage. Except with evocation. Traited I have a 15% bonus to area of effect abilities. But only evocation effects spell mastery chill strike, not the feats. And the Sudden Chill feat also doesn't effect it while in the spell mastery slot.
I have been wondering this myself, though the servers went down before I could test it. I mean all you would have do is to use it while in the tab slot a few times and then in a normal slot a few times. I personally have a big enough bonus to AoE damage that it shouldn't take much to notice a swing in damage if it does…