I have just rebuilt my evo and have put an exedy twin plate in it. I'm finding that its a real pain to drive. I know there is a rattling noise when you press on your clutch pedal but I also have a loud (almost grinding noise) when letting off the accelerator at high rpm. The higher the rpm, the louder the noise is. The friction point also changes from up high to down low whilist driving in traffic. Could it be a bad install ?