How can i improve My Warrior ZDPS Sunder Damage ?

im 41lvl i have so hard time in act3 even rare mobs are big problem



what should i do any help ?

Sunders numbers are based on it consuming broken armor for the guaranteed crit.
get rid of resolute techn, attach accuracy to your aura.

use bone shatter with devastate to proc broken armor on the heavy stun.
this gives you both the broken armor plus the much needed time to warcry+sunder for the giga dmg.