wow zangeif i didnt even know that you were using 15/70s. though i dont reccommend/advocate them i can say that you really shouldnt be having any problems with most classes. with that kind of mana pool and damage and life, your guy should be one of the finest gear wise.
o yes.. and i blame dysync. my wc barb got mass dysynced when dueling running zons tele barbs and necros. but really just pratice and get used to the build, eventually you make up your own strats and find other ways of dueling well besides from the advice most people give you. experience baby.
edit: i dont know if i mentioned this before but dont get 200 fcr. i think 105 is just fine. id swap the coa for a shako as well. arach 20, ammy 10, hoto 40, mage 20, 2 mass mana rings with fcr 20, and youve got 110 breakpoint with moer mana and life than with your coa set up.