Hi,how did you get on with your problem with your clutch??? I did not hear back from you after the last response, I hope that you were able to get it all sorted out. please let me know if you have any more questions.
The freeplay is not actually adjustable on your car at the Slave. I have heard of people adjusting pedal at the bulkhead at the master cyl and removing freeplay by changing adjustment there. I think to be honest with you that you probably need to go back in and check the flywheel, I would imagine that it needs machining, if it was done then they may not have got it right. which effects the crush on the clutch plate. I read the post you said you were in fourth gear going about 20mph, that would probably be enough to damage the flywheel and clutch plate anyway. I would suggest removing the box again and taking another look, have the flywheel machined properly, I am almost certain that there will be a problem there, especlially after slipping the clutch like it has been since you put the new one in.
I hope that whoever put the clutch in can help you, because I think that you will probably need a new plate at least. let me know how it works out