Blow CDs all at once, or one at a time.2010-03-04 00:00:00Are you talking endgame? I'll assume you do.
I usually blow BW very early each pull I can. That way I know it'll work to its full potential. In combination with BW I often use a trinket as well (use trinkets virtually when ever they're up and you're in combat, they're on such a short CD it's barely noticeable). When the trinket's worked its magic I FD if I'm high on the threat list, if not I nuke until BW's finished. After that I usually FD whether I'm high on threat or not.
I use Rapid Fire on the pulls I can when BW isn't avalable (ie. I don't use them at the same time), also often in conjunction with a trinket. If you have a weapon faster than 2.5 (base) you should probably pop Rapid Fire whenever a shaman pops since it's very hard to keep an efficient sho...