So, in the Warlock T19 set, our two piece bonus is that we (a) now store three charges of Conflagrate, and (b) Conflag's cooldown is reduced by three seconds.
To me at least, this seems incredibly powerful, especially for Roaring Blaze. RB is a 25% damage boost to your current Immolate's damage (until it expires or is refreshed), and it stacks multiplicatively. From that we get the following math:
Immolate + [1] Conflagrate = 1.25 damage multiplier on Immolate for its remaining duration
Immolate + [2] Conflagrates = 1.56 "
Immolate + [3] Conflagrates = 1.95 "
Immolate + [4] Conflagrates = 2.44 "
Immolate + [5] Conflagrates = 3.05 "
With Havoc as a mechanic, assuming there are two targets present when we apply Immolate and buff it up, all of the above values are doubled in a sense, as it is hitting two targets.
I think four Conflagrates is a bare minimum for how far we will be able to buff our Immolate, and maybe even five with enough haste. Of course, it goes without saying that Backdraft also scales with more Conflags, but with the two talents currently neck and neck, I have to imagine that RB will simply be better due to its strong scaling.
Has anyone else come to the same conclusion or is there an argument to be made for Backdraft?