Balance for classes in solo

Hey guys,

i just started an evoker playing devastation. my main is hdh. im now at 623 with the evoker and am not able to solo siren islands bosses for the citrines. they jusst hit like a truck and i have chain armor. dh has leather. my dh was able to do this at 589 without any risk of dying. what use are the many cc's as they don't work on this mobs.

slightly imbalanced no?