Experience with track broadening Boxter 986

Hello, on my Boxter S on the front axle 15 mm distance discs / wheel tire combi 7.5 x 18 with 225/40 mounted. Since then the front axle seems more nervous – have you made these experiences with corresponding conversions – my PZ Allgäu thought that this would be normal, since the front axle is sensitive to such conversions – the standard 5 mm widening did not make any “problems” Would I be happy if you told me about your experiences. Greeting, André