I purchased a set (front and rear) of the smartmadness progressive spring set for my 09' Smart Brabus. I noticed when going over bumper or uneven pathment, the front and rear springs makes a noise. It sounds like the springs are rubbing against the metal base as they compresses or slight turn under compression. Does anyone experienced these noises? I'm thinking it is either not sitting correctly or I need to install either some thin rubber or plastic pieces between the metal base and the springs to eliminate these noises. Car drives fine for over 3000 miles but the noise is quite irritating. Thanks.