Hmmm, at 1,325 kgs or so your car is not particularly heavy so methinks the 288 mm discs should be OK when a 1,470 kgs 9000 Aero makes do 280 x 25 discs up front (and still set a record 34,9 m from 100 km/h in an Auto Zeitung comparo - what kind of pad compound are you using right now?