Hi all really need to pick some brains

I've got pretty much stock rst s2
Ony as a chip ecu and t3 turbo with 360 roller bearing and a exhaust

I've just had a full stage 1 clutch kit fitted brand new quadrant and cable so all is new but the cluch still slipping
With lowest of boost at 7psi the flywheel looks to be in top condition too just wondering if anyone else as had this issue and have a idea on how to fix it many thanks