@changchewsoon , it would be great if you could verify my following conclusions with your Tuner, if you don't mind and post his responses here.@DutchA45s that is great to know that, I am sure now you can enjoy the car even more!
Just for your information the CPC is definitely not responsible for your clutch slip.
Just like your car my TCU software is also currently stock at the moment, but with the CPC upgraded I was able to go for higher torque.
1) The ECU has tables which allow him to request increased clutch plate clamp load pressure from the TCU.
2) The CPC acts as a "Gate Keeper" and will not permit certain values to be exceeded, without recalibration.
3) As a result of (1), it is actually not necessary to access the TCU, purely from the objective of increased torque capacity.
Obviously your further input would be greatly appreciated.