I just bought brand new 17' AMG rim and Kuhmo tires from Tirerack. They are 17x7.5 (225/45/17) front and 17x8.5 (245/40/17) rear. What tire pressure should I be running front and rear? The manual shows 28 psi front and 32 psi rear, but that's for 15' stock rims/tires. Thanks Luke!