get the glyph that prevents flame shock from being burned up by a lava burst. ( sorry, couldn't look them up from wowarmary )
a few other like more mana from water shield and I think there was one for lightning bolt.

lazy mans cast, max dps and only lightly mana expensive when flame shock is cast too soon
/castrandom flame shock, lava burst,lightning bolt

and a manually applied shocks ( extream mana efficient used for raid boss fights )
/cast [mod] flame shock
/castrandom lava burst,lightning bolt

or both so you can start a fight with a flame shock and it will re-apply whenever it can
/cast [mod] flame shock
/castrandom flame shock, lava burst,lightning bolt

I usually start the fight with a flame shock ( alt+this macro)