As Porkie has said, for the road AP 4 Pots are fine.... they are also fine for track, dependant on how you drive that is.

I have AP 6 pots with 355mm rotors on mine and I have to say on track they are nothing short of outstanding. I did 60+ timed laps at Tuner GP @ Snetterton and never had any brake fade during the whole day.

Marco,
Sounds like your braking system is over servo'd mate...... the feel on my AP's are perfect?!?