I am going to say it, I have chi-you's, zenesis, and some rollers, I can attest at least a 15% harder hit with my BBM steam punk. The only thing I can think of as to why is the copper tube. All brass chi-you no comparison.. Double checked all connections for oxidation, same batteries, etc, I'm not alone in this - the BBM SP requires you to recoil your atties and add at least one more coil for more resistance! It hit's harder than anything on the market. I use no-ox-id all on my other mods to help with conductivity where the treads are involved, not with the BBM SP.. no need (yet)...
I am going to say the actual copper tubing metal plays a role here, and rocks this thing.. If I had the equipment I would run a voltage drop on this mod, but the clouds I get on this tell me everything I need to know...
BBM Steam Punk is the best mech on the market. Feel free to watch The Hill Giants review on it for a second opinion.
-CF