If you're on a dispenser/cart the short circuit is great. I think it's fine as it is. It's meant to be a defensive weapon like the homewrecker. If you lower the metal cost too much it'd encourage people to use it offensively.As an Engineer player. Short Circuit needs some buffs, it is pretty useless otherwise, apart from protecting to half-assed demo spam.
It would be a lot better with faster weapon switch, and lower metal requirements. It would say 25 metal is good, 35 is too much for what it does. Widowmaker uses 30 metal, and it is amazing if you know how to again.
Also, it's overpowered in Saxton Hale.