For CoS, I've gotten into the habit of pulling with AS, then when I get close enough I cast Holy Wrath. It gives me 3 seconds to position myself so that I have enough time to run to the caster in the group and position myself without eating the crits from the melee mobs. I use a castsequence macro with just Holy Shield, Hammer of the Righteous, Judgement of Wisdom, and Shield of Righteous. That macro is bound to the same key my dps are spamming. I manually weave in Exocism and Consecration. That way I don't burn through all my mana and still hold aggro.