At the moment, you can only go 60% faster with feruchemical steel compared to 3x faster with allomantic pewter. I think feruchemical steel should be faster than pewter, maybe 10x base, but still drain just as fast. It would make it more like it works in canon. Maybe a way to make it charge slow but spend fast with the same storing debuff but a higher tapping buff?

Cosmere 2.0.0-beta.40 | RimWorld 1.6.4871 rev591 | Windows 11 (10.0.26200) 64bit
Cosmere - Core [cosmere.core], Cosmere - Scadrial [cosmere.scadrial], Cosmere - Roshar [cosmere.roshar]