Your macro does a flameshock, lava burst, lightning bolt and a flame shock lava burst again...

LvB 1.5 second cast, LB 2 second cast and the flame shock is 1.5 second GC = 5 seconds

Aka your shamans does nothing for 3 seconds unless my brain is mailfunctioning and the CD On LvB is 6 seconds?

I would recomend you to try and stay away from castsequence macros with caster dps, main reson is heavy loss of dps when you pop bloodlust since your macro will be waiting for LvB to get off cooldown.

I would agru that the flameshock glyph is better for you atm then the 10% extra damage on lava burst, but im not realy that good with calcing out dps.