I popped my CDs on the opener, then used Ravager whenever it could hit 2+ targets, or if I could guarantee a 100% uptime on my main target + a CS on it, where as I used BS almost on CD, unless either adds or big dude was about to spawn, in which case I saved it for that. A small note is that I spend all my time on the big add, as I'm on interrupt duty, so I wasn't too much concerned about the spore shooters or the mind fungus other than when the big guy wasn't up, so if you're on "clean up duty" you may want to consider saving something for those.