What is your BLM rotation?

[Underlord]

Maybe I misunderstood, but you don't really want to be using thundecloud procs whenever they come up. It depends on the time left on thunder. Thundercloud is more potent than Fire IV, but only if it's allowed to tick near its full duration. Don't remember the exact time at the moment. But doing something like TC proc > Fire IV > Fire 1 > TC proc would be a dps loss unless you are using the second TC on a different mob. As a general rule, 1 TC per Astral Fire phase unless it's like maybe at the very beginning, and very end.

Yea sorry should of clarified that. Ill use thunder proc on one mob, then other proc from swiftcast on a differ mob. Then if proc comes again I recast on 1st mob to lengthen it.