I've recently installed exedy 4 puck sprung clutch kit to my 4g92. I've just reached 500KM on it. I understood that this type of clutch would be much more stiffer feeling and also it can cause the car to vibrate especially during a standstill start of in 1st gear. after taking the car out from the workshop, it feels like expected on puck clutches. (jerks/vibrate during releasing clutch at 1st gear from a standstill). after driving it in for 400-500 KM, the clutch starts to feel much less vibration/jerking feeling during releasing the clutch on first gear from a standstill. and the strange thing is sometimes it vibrates/jerks more. somehow not consistent feeling. is this normal??