Hello.
I think the problem here is pretty evident, since the resource generated by Chain Lightning in the elemental spec is heavily undertuned. Getting 2 per target is pretty bad and a downgrade since Legion when it generated like 5 or 6 per enemy.
In damage it’s kinda ok, but still worse than Lava Burst to generate resource in almost every scenario. It gets more damage from 3+ targets but less maelstrom in almost every situation except 5 targets.
I think it should get 3 and maybe 4 per target to be game changer in that situation.