Well you should never spam force storm as a start, it is only used to stop node cappers and to get chain lightning procs.
Something along the lines of this is fairly optimal
Assuming you hybrid use affliction on several targets to gain access lightning barrage more often. Use wrath procs on crushing darkness first and if you have 4+ seconds leftover on wrath's cooldown use wrath on lightning strike for a chance at a lightning storm proc. Use instant chain lightning and death field to create AOE pressure and attempt to only use these when enemies are grouped up. Only use lightning storm on 3+ targets and keep track of the internal cooldown on lightning storm. Use force lightning as your filler and force single target damage. CC appropriate targets with whirlwind and keep your static barrier up at all times.
Using this you should be able to almost double that damage you mentioned