By grub screw mod, you\'re meaning to stop the bov from bypassing the increased boost?
Clutches can go bad anytime depending on how it\'s been \'bedded\' in, installed to what type it is. I wouldn\'t assume the 2000k would have been nice nana driving
You mentioned burning clutch smell? Guessing you\'re launching it and aggressively shifting too? (I don\'t know if you\'ve got a heavy duty or brass button etc) but burning clutch smell isn\'t normally good either.
See if you can take it back to them and just trace back to what\'s been changed since, or what you think the problems could be and sort it one by one. Hopefully it gets fixed soon (crosses fingers)