Hendrix Engineering:
http://w.ivenue.com/hendrixengineeri...-clutches.html
Separate clutch reservoir:
http://www.camaro5.com/forums/showthread.php?t=236850
No, I'm not certain because I can't see your car. I'm going on what you're reporting. It is well known that the stock clutches in these cars is garbage. It also sounds like the shop you're using is not qualified to work on your car.
Find a new shop. Install the above items. I would bet things will be fine after that.