I'm going to move this one out as a) we are treading very close to "please craft a custom rotation just for me and if it's not too much trouble could you stop by my house and push the buttons for me too? Thanks!" territory and b) Nooska and Whitefyst have covered this already in their replies. Please fix your profile as well, there is no such character on that realm and we don't allow anonymous posting here.
Oki and how about Explosive Shot? It'S 80k Damage and you possibly cast one ES less if you do start the fight with other Abilities.