try staggering the tires. For example when you buy an Aventador, or a Ferrari, or really any big horsepower rear wheel drive car, what do you notice about the wheels? They're always bigger in the back. Why you ask? Well more rubber equals bigger contact patch, meaning more grip. So it stands to reason that to make these cars drivable, manufacturers put more grip in the rear than in the front, and in a lot of cases these cars can still oversteer pretty easily. My point is, try putting more grip in the rear than in the front by way of using softer compounds in back than in the front. This has helped me tremendously with EVERY single rear wheel drive or mid engine car in the game. When the cars are controllable and you can actually compete this game is fun on another level.
Remember overall grip and handling is improved by working all four tires effectively. If your car is spinning out because you have the same tires front to back, most of the time you notice one axle of the car is working a lot harder than the other (ie it becomes red way sooner), if this is the case your car's grip needs to be balanced so that you can redistribute that load across both axles. This improves grip and stability.