who has used these clutch's???

I have one in mine now and i have just rebuilt the engine so running it in at the moment.
I have 400 miles on the engine and all is good, I get it mapped next week so looking to run some good power.

But the clutch is slipping now in 2nd when I put 0.5bar boost, going down the motorway today in 5th and as soon as it hits 0.5 bar boost it slips.

i know you need to warm these clutches up so i went to a junction and slipped the clutch for 10secs pulling away and nailed it in 2nd (just upto 6000rpm) and guess what, clutch slip.

Question is, how much do these clutches need warming up??
it cant slip with the power i am running as it is a run in tune, the boost is low and the tune very rich. I am due to go to the dyno 400 mile round trip and dont want it to be a wasted trip, id rather change the clutch now if there is a problem.

Sorry for the long post