I don't even have maul on my bar. trust me, take it off and you'll feel better.
50 (or even 25) energy for 2-4k damage is AWFUL. Use your deception endline (I don't know what it's called for jedi shadow). Not only is it's average damage per energy better than maul, but the stacking buff to make your shocks crit for 4-6k is pretty nice too. All I do is Volatic Slash, Shock, Discharge and I kill people pretty darn fast. Not as fast as a pre-nerf operative, but still, fast. I love the class and spec!