Michelin Pilot Sport 4

Hello guys, would like to ask me how satisfied or dissatisfied you have been with the series tyres of the Proceed GT since. Mine make noises in tight curves as if I had stones in the profile. Left as well as right identical. Straight run no problems. Air pressure I drive 2.6 bar. Running performance so far ridiculous 60 kilometers, so brand new. I would be very happy about your opinions.