If you need hit/expertise in 5 mans you are doing something VERY wrong with your rotation, there was some justification for having threat stats back when the threat modifier was 300%, now thats up to 500% you just don't need them at all. So what exactly is your rotation?
Spec wise (fingers crossed the links work) THIS is highest threat single target spec, while THIS is the most rage stable single target spec. Basically you want same variant of 8/2/31 with 2 points flaoting between Imp.Rev, Safeguard, and Thunderstruck. You should change your meta at your CTC the Eternal is optimal, think about getting some better trinkets, Spidersilk spindle is fun, and the Mirror of broken images can be ridiculously good. The two you have are a bit meh. Scales is noce but you have to use it often and effectively to make it, well, effective and the stam's not something you particularily need, Stay is also a difficult trinket you use well, and while the static dodge is nice you still would prefere mastery.