The problem isn't really that ele has RNG; it's that their RNG is so bursty. maybe Lava surge procs should be changed so that it can't be replicated by ele's mastery and talents. Then damage could be shifted elsewhere.
But this is the problem. Damage can not be shifted elsewhere, at least not enough of it.
Put it in Lightning Bolt? You're now messing with Enhancement single target damage.
Put it in Flame Shock? You're now messing with Enhancement AoE.
Put it in Earth Shock? You're risking messing up Enhancement's single target rotation.
Put it in Fulmination? You're now shifting the same problem to a different spell.
Surprise, nothing's left. Unless you want to shift all that damage to Searing Totem which will probably just cause a mass exodus from the DPS Shaman specs.
What needs to happen (in my opinion) is:
1. Lava Surge needs an ICD that includes Lava Burst casts. Creating a break of at least 2 seconds between Lava Bursts (not including Mastery procs). This would allow enemy players to at least react by using a defensive between LvB chains.
2. Echo of the Elements needs to be replaced / reworked because it's just too much RNG.
3. Elemental Blast needs to become an Elemental Shaman exclusive spell (with a new 90 talent taking it's place). This way it also gives Blizz something to balance (be it the damage, stat buff, or by adding in a Feedback type mechanic) that won't effect the other specs.
EB (with possibly a bit of retuning) and an extra level 90 talent can offset the proc nerf to Lava Surge.