what kind of check are you doing to prove no deffects in the CF? that is the only thing i would be worried about. CF has limited strength when there is a deffect. Steel has been perfected and good manfactures have no inclusions.
keep me posted on your products. what kinda prices as well.
as fo rthe springs; CF leafs are used on the one of the cadilacs using the corvette suspension and transverse leafs. so as a spring materila they are fantastic.