I am about to replace tires on a 2020 Q60s red sport 400. Came with Goodrich Potenzas, which only provided 21k miles. Also, they ride a bit hard. Tires are run flat and sizes are 255/35/R20 and 275/30/R20 - wider rear. Car is RWD. Anyone have any alternatives that they have installed? Dealer wants $1,650 installed and I have found the same tires for less, but I need more than 21k miles. In fairness, I do “drive” the car.