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Yes, it is a complex series of track tests to find the perfect combo for each vehicle. Some cars are designed with too much oversteer, so the narrower front tires tone it back down. Some cars are weight balanced front to rear a little better, or have different damping on the shocks, etc... to induce the handling aspects of the car. There are a lot of variables. Changing tire width is just a simple fix.
If you go with wider rear tires, you give up a little ability to use throttle oversteer, unless you add more power to overcome the added rear traction. Some guys prefer using the narrower rear tire to be able to throttle steer a RWD car when they get into trouble. Nothing like having extra hp on tap to re-direct the vehicle (aka slide the ass out) to fix any understeer. haha
Even more important than tire width, is tire compound. Softer tires will stick on a track better, it will make it feel like a different car. But, softer tires also wear out faster if you aren't good at following an efficient line through the curves. It is better to master road course work on a street radial, to learn the fast lines. Once you can master the speed through the turns, then step up to a race compound to push it even harder.
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