As a warrior you should have no problem achiving 490 defense to reach the crit cap. A side note is also to make sure your char sheet displays at least 491 to be totally safe incase there is a rounding error.
Reaching the crit cap is a tanks first priority, before stam, armor, anything!
Defense is better than resiliance for a warrior tank period. Try to get some more wepons or gear that has equips to defense already built in.
There is something so appealing about backhanding someone across the face with a shield.