Railgun may be better in some aspects, but his mech will become too heavy to handle a Railgun. Also, I think WindForge is considered one of the best drones.
Why does he need a resistance drainer with a boiler mech?
I would recommend he removes his Savagery and get the Heat Bomb, it can be a life-saver sometimes. He also needs more HP, it's vulnerable to Physical and Explosive (what I call mechs that aren't boilers but focus on doing damage) mechs.
First thing. It's a drone, not a pet.
Your mech needs a higher regeneration and cooling. It'll die easily to boiler and energy mechs. Replace your Massive Stone Feet with the blue Massive Feet.