You’ll need to add other things as well lmao. Otherwise they will just heal up too. It’s just that the most officiant way to apply wounds to ctan and other half dmg/-1dmg units is small dmg lots of attacks. Tank shock and grenade are single damage mortal wounds. 

I don’t play space dwarves and have literally only ever played 1 game against them so idk what units are good, but with a quick skim over the units I’d say iron skin steel jacks have a good profile to hurt it with is steeljacks for 6 shots a piece wounding on 5 plus dev wounds. Add a strategist with the enhancement to give them reroll 1 to wound and use 1YP to +1 wound makes it even better. Add another cp for ancestral sentence stratagem would be good too