Honestly quite supprised your still running this car on normal tyres, R888's don't last long as they only come with 5.5mm of tread new where as Yokohama AD08's come with 7.6/8mm of tread new like other road legal tyres. The other factor is 180 treadwear vs 100 treadwear on the R888 tyre.
Whats your current spring setup 8/7 or 8/6?
8/6 iirc