Silly question, but, are you slotting for accuracy? A single Accuracy SO (or 30+ IO) will get you to 95% chance to hit against +0s. And that's before the defense debuff in Venomous Gas (which I think is auto hit).
Maneuvers/Assault and Tactics is another good choice, as biostem said, though poison can be a bit end heavy, so running two of those toggles can hurt the blue bar, but hey, two leadership picks means you can get Vengeance!