Scuffing the bell will allow the shoes to wear prematurly though you will get an improved 'BITE' on take off. The 1.1 springs I agree with but the carbon shoes, I'm not sure about them, I prefer Mugen white shoes. But then it's down to driving style and I know I dont like the carbon shoes. Now Sliding clutches theres an idea for you. Or even a Centax. superb Bite and durability but at a price.