Unless armory is messing up, put zerking on your wep. and gem it. Also getting rid of the +16 str gems and getting epic ones. Also i'd say choose either imp execute, or Wep. Mastery and fill one or the other with both points and dropping the other. Might also look into gemming for more ArP, alot of arms warr's swear by ArP > str. Also since you are low on expertise, make use OP as soon as it comes up from either a dodge or a proc.