It depends on how much AOE your group is capable of. If the adds are dying quickly enough that you get very few ticks out of SW:P, you could have used those GCDs to Mind Sear instead. If they're slow to die (and assuming your group isn't getting killed in the process), then your strat would get more DPS out of it.
My group's healers had a lot of trouble with those adds, particularly if we had a yellow ooze up as well. I kept DPSing the boss until they were about to cluster, then only used Mind Sear. I lag a bit, so the maximum I had been able to dot up was maybe 2, so I figured the time spent doing that and switching targets for Mind Sear when one died could have been spend on a bit more DPS on the boss.
Either way, it's just preference and what works best for your group.
Originally Posted by Purpleisbetter
Power Torrent, Volcano and Theralion proc'ed, dots just refreshed. Everyone dies. Just a tank and a boss with around 200k hp. Everyone in vt yells "omg we failed omg omg" and you "don't worry amigos, my dots are steamrolling!". Boss dies while you'd say "Enjoy your loots" with a lot of purple awesomness spilling thru your voice. Just happend yesterday.
Seriously, i thought i'd reroll warlock for 4.2, but that was the sign that i'm purple inside and i can't reroll. never.