I went to SS lines,track pads and fluid after suffering severe brake fade (turn 5 at Road America). I have used different pads and each of those has a different feel to them (initial bite etc.) I can't see how SS lines alone will make a very big difference. A sad fact of the Z06 is the brakes are overboosted(I heard one race instructor say they are like that so women in high heels can stop the car with their big toes).
Thanks guys, I wanted to rule out SS lines as a contributor to my spongy pedal feel (see post in racing section). Your experiences sound like what I was expecting to feel. Looks like the SS lines were not a cuprit.