I save my procs because you get a slight lull time by using them in the middle of your rotation. By continuing the rotation with Astral Fire III active and kicking out Fire I's I have noticed that my DPS increases when procs are used at the end. I'm not going to sit here and claim that what I do works for everyone else by any means. I'm comfortable with my rotation and I'm always behind the tank in hate regardless of fight. To me that's enough to justify to myself that what I'm doing works for me.