Logs if needed. We went from having Hunter solo first and 2 dps on second, to Hunter solo first, then me second, to me doing both (even though at 1/1 I was sitting fine at 32+ mln to boss). Somehow this ends up being better, though my dps started to suck. Last try I got <18mln, and I'm running with KJC atm, not doing weapons though. But I guess you can say we sorted p1, even though I know I could do better (we're beating him before third star but after set of adds come).
About temple which will be another layer of wipes. My CB without any buffs is <1mln, not sure how I'm supposed to get 2 adds down before second cast with just shadowfury stun and one copied CB. At one transition I did double Havoc-CB and it get them down somewhat to near SB range. So bassicly what Thelm says (you run more Haste centric Thelm?). Problem, I don't have dps paired, just Resto druid with Bash. Maybe AD will help with that a bit. Infernal also stuns but... yeah.
How do the adds work anyway? They activate on proximity, or only damage? Do you need to have someone in melee? Can't really test them since on heroic they wipe and on normal they dieded too fast to notice .