At FP 6, it gets it’s second bolt, which makes it better for crowd control, so I don’t think the decline will be too impactful.
But of course, I can nerf the buff for lightning so the decline is gone.
https://cdn.discordapp.com/attachments/560838017539899394/804329248579387405/CIU-WeaponData-v66.override.xls
The reason why Lightning had a constant higher overheat till fp 6 is because it only has one bolt, which makes it hard to deal with more enemies at a time.