Originally Posted by
Grungrungrun
Right now you can get the following out of your combustion if you start with a hot streak (and it doesn't lag too badly):
Crit -> FB -> Combustion: Pyro, PF, Pyro, PF, Pyro, PF, Pyro, FB, Pyro, FB, Pyro
Seeing how the first Hot Streak will be achieved by using a Fireblast, if you use Flame On, you'll have 3 more Fire Blasts at your disposal for the rotation. That means you will want to have at least 2 Phoenix's Flames for your rotation because otherwise you're missing out. Additionally, saving a Phoenix's Flames to fire off at the end of that rotation, since it's a guaranteed crit now - will make it profit from Pyretic Incantation (and that is just so good) so you may want to do something like
Crit -> FB -> Combustion: Pyro, PF, Pyro, PF, Pyro, FB, Flame on, Pyro, FB, Pyro, FB, Pyro, PF
In any case, more instant casts during Combustion = more Pyro procs = more damage
Unless you have a substitute for PF as an instant crit hot streak procing ability, I don't see you not wanting to use them during combustion.
Obviously I may be totally wrong but that's what my gut tells me right now.