Originally Posted by
Harsesis
First question: You should not be saving fury for these events. Things like procs and BL are there for you to throw up things like a buffed doom. They also affect things like imp swarm and a service demon. You mastery also affects your spells while in caster form so DS is good for both.
Second question: While Soulfire in general has a higher DPET than ToC in general you shouldn't use it. The reason being that you want to use those MC procs to cast Soulfire in caster form so that you gain more fury faster than you would have from SB. More fury means more meta. The time to use Soulfire in meta is when you have enough fury to cast nothing but Soulfires until the end of the fight or very close to it.