Wemooz, if you don't mind spending a little bit of dough first, buy one of these
New Cool Tool - DeWalt DC410 Inspection Camera - Quick Review with Pics and Video and then zip tie the camera end pointing right at your clutch fork/slave interface. Use the wireless screen to watch it a little bit, as you are driving in a safe parking lot, until you're sure as to its appearance when it is working properly. Then get the car nice and hot and watch it via the screen as it misbehaves. That will almost assuredly diagnose it for you. You can even snap shots of it, videos too, and post them here. I did that in the thread for the fork/slave interface, in fact. Just do the same thing.