Originally Posted by
Exoter175
Unless I am gravely mistaken, both of your trinkets actually proc from damage done, not crit.
Regardless, the information I gave isn't incorrect. My current gearset does just that, and I'm willing to bet that the OP's does as well. And, as it turns out, yours does too. Granted, you need to have done some degree of damage for yours to proc, whereas we can "Cheat" the proc by casting spells prior to engagement.
That being said, a precast Pyroblast CAN proc your trinkets, and, in the event of a pre cast critical Pyroblast, you SHOULD be combusting immediately before that ignite gets munched.
Believe it or not, you can't always wait for the "best case scenario". It is strongly advised and encourage to ALWAYS combust when you have a Fireball/Pryoblast Ignite up +LB +CM+ Pyro DoT, even if you don't have a trinket proc'd.
As a matter of fact, your way using a Double Pot + Trinkets, requires you to pre-cast Pyroblast + LB and pray that your next Fireball crits, and likely clip an LB just to assure you get a double trinket + PoT + Synapse/Lightweave Combustion inside of a 3 second window, realistically speaking.
Consider, for a moment, the possibility that your trinkets/lightweave/synapse don't proc inside of the First pot window, and take a while to line up. You could very well clip an entire Combustion cooldown from your combat log by waiting, with the net result being a DPS loss.
In short, never rely on a proc you can't control to use Combustion. If LB is up, Pyro is UP, Critical Mass is up, and you have a Fireball/Pyroblast Ignite rolling, ALWAYS use Combustion.