I am current using a wider tire compare to the stock size on my 360 spider. current size: 235/35/ZR18 front, 295/35/ZR18 rear. stock size: 215/45/ZR18 front, 275/40/ZR18 rear. I have been told these wider tires would actually worsen the performance on my 360 which I find it hard to understand. Can someone help?