Only reason I've really found to specifically save procs is for when you need extra damage in a very short period. Like, if your group is having trouble killing bulbs fast enough in T6, you can watch for bulb timing and save a proc to Fire III the center bulb as soon as it spawns. Similar idea for conflags in T5. Other than that, I don't really see much reason to save procs. When it comes to having to move, generally you want to do as much damage as you can when you're stationary.