I usually do Unmend -> Plunge -> Unleash + Salted Earth -> Shadow Skin or Dark Dance -> Dark Arts + Blood Price + Abyssal Strike -> Abyssal Strike -> Dark Arts + Abyssal Strike -> ....

You throw Defensive CDs as needed and Soul Survivor on something. Eventually you get low on MP and start doing single target on low guys. That's when you use Bloodbath and try and Mercy Strike to get the HP.

By spamming Abyssal and Unleash while Blood Price is up, you shouldn't have too many issues holding aggro.