What Cooldowns Do You Use For Perpetual Ray Sets?

[Awful]

As a Dark Knight I usually:
Discoid 1: Always have Delirium up (if no monk is present), Dark Arts + Dark Mind
Discoid 2: Delirium up, Shadowskin, Convalescence
Discoid 3: Delirium up, Shadow Wall, Dark arts + Dark Mind
Discoid 4: Boss is usually dead by now if not Living Dead and every other CD I have left

Edit: Drk tanks should REALLY use Delirium in heavy magic damage fights if no monk is present, boggles my mind that NO Drks ever use it.