ok rotation then...
SrS (once at the beginning of the fight aslong as if doesnt fall off) then CS (macroed with silencing shot(has no gcd) then AS then SSx3
You can also have kill command macroed or push it indiv when its up i prefer macroed
And yes he should start aiming for the softcap of ArP because if hes doing 25ICC and he gets DbW then he is going to have to put everything to ArP to aim for the hardcap