Originally Posted by
Vomitory
I've been having trouble with this as well. Especially with the level 90 talent choices, they both require some set up before maximizing damage output. If you take the spell power on Evocation talent you run out of mana very quickly as well so it's required between several pulls in a row.
I've been going for Living Bomb, Inferno Blast to spread it, Flamestrike, Arcane Explosion. This is to make sure LB has a chance of expiring and exploding before they die, it might not be optimal. I'm lucky if a lot of smaller trash lasts the duration of an LB...