Stick to deception. It's a lot less crap to watch, and the only decent DPSsins I've seen are deception. Volt slash, volt slash, shock, discharge on cooldown, maul on proc, blackout at the end of a force heavy rotation or as a cooldown when you might be taking heavy damage (force cloak as well). And of course, always begin your combat in stealth mode for the free dark embrace.
Isn't the Thrash from Madness better than Voltaic Slash?