I have a question how important good valve springs are to optimal cam performance. Right now I am running stock TFS TW valve springs with my new FTI custom cam. The lift on the cam is a little past the recommended lift on the stock TFS springs. Can this hurt performance? Basically, the car doesnt feel as fast as it should. I have new double springs here not installed yet that I bought from FTI. Ed recommended I swap out the stock TFS springs. Basically, can the stock TFS springs hurt my cars performance if thier too weak?