Yeah, the fault is I'm running Bluefin stage 2! And the standard ST clutch is made of chocolate! So therefore doesn't like it when you put a bit more power and a lot more torque through it. The RS clutch is what I need as thats rated for 400bhp, however it's rather expensive. I am saving for it but its not going to well!
It's a common problem with the ST, and common for it to be worse in the winter. Mine slipped a little bit in 5th and 6th when using all of the torque last winter, but then as the weather improved and the temperatures rose, it disappeared. Now the weather and temperatures have changed, it's back, and considerably worse!
Got to get me that RS clutch!!!