Hey Ferdzz,
Sorry that you're having so much issue with your clutch. I've attached a link to our tech articles on the 996/997 Transmission. Hopefully the guides will give you a better shot at diagnoising the issue. If you have further questions, feel free to post a Comment just below the article and someone will get back to you with some info.
Porsche 911 Trans Tech Articles -
Porsche 911 (1998-2012) Technical Articles - Porsche 996 & Porsche 997 - Pelican Parts
-Dmitry