I have put this in the technical forum but would be nice if someone on this forum could help me too

I have got a s2 with a ap organic clutch which i just bought around 4 months back but the problem is that i think its starting to slip. Ive been running 185bhp since ive bought it. When im in 1st and 2nd gear its fine but in on hard acceleration in 3rd, 4th and 5th gear that you notice the problem. When the turbo kicks in at around 2800rpm the revs rise to around 3500rpm but then settle down to 3000rpm and then its fine all the way to the top. Any ideas or is my clutch on its way out as i say it only happens when the turbo kicks in that the revs suddenly jump