Hi there, and welcome to the forum
. One thing you have to keep in mind is that to maximize your damage you must ALWAYS keep your dots running on the boss. I'd think some of your dots will have run out by the time you have cast 5 shadowbolts. I cba doing the math though ;). I am also affliction, and here is what i do: Immolate, UA, Curse of Agony(if im not on COS or COE) corr, siphon life, and then 3 shadowbolts. By the time i've cast my third Shadowbolt its time to put up an new Immolate, then UA will come off again, then corruption and Curse of Agony. Darkpact any time imp has some mana for me to use ;P. But yeah you get the idea, keep dots up at all times, and spam shadowbolts. Then you shouldnt have problems being in the high end of your damagemeter.