Your accuracy seems a bit high, (I have 285 points of ACC at the highest tier of gear). The dev's have designed it so that every enchancement on gear will either come with surge or accuracy (or alacrity or some other defense stats we dont care about). Because of this if you just keep your ACC and Surge about even you will cap both. I personally use only power augments, but both STR and PWR effect the damage of all of your abilities (since this is actually based on your bonus damage stat).