Raiju's Harness has always had issues with super gain from killing jolted targets, and I believe I found out why. It seems the target must be killed [i]while Jolt is going off[/i] in order to give super energy. Note that killing the Jolted target in a way that doesn't grant Raiju's energy still correctly procs Spark of Ions. Also, the additional lightning strikes do not scale with the Super stat. Unrelated, but Gathering Storm's damage is kinda not good (worse than Silence and Squall, a CC/semi-support super) and could use a boost to bring it in line with other supers. But I understand if this is no longer a possibility.