Okay, you have the evil eye of galakras, this will be easy!
Spec out of bloodbath, spec storm bolt. At your ilevel the scaling is absurd, line it up with CS and always storm bolt during CS. It does a ton of damage, way more dps than bloodbath.
If you can get 2hrs, TG is currently scaling way better than SMF.
Rotation: BT on cooldown, CS on cooldown, RB whenever it's up, if it's a single target fight then spec DR and use it on cooldown (preferably when CS is not up). Bank rage for HS dumps during CS, make sure you spam HS in addition to your normal rotation during CS. Only HS outside of CS if you have 90+ rage.
< 20%, pretty much execute spam while still using BT/CS/Storm Bolt.