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Ok since this thread has moved so far away from the original question I'm just going to share my experience with the FRS exclusively on a few track tires. In his case its not about what will net me the fastest lap for a given class or the fastest average lap for an entire race.
This car is light and the rear end is extremely light. The biggest problem most of us have had racing the car is getting heat into the rear tires. It is so difficult I wouldn't even entertain running anything but an "A" comp equivalent even for track days. I really struggled when I raced the car in a "140" wear rating tire class until I ignored everything everyone told me about the correct pressures for Hankook RS3s. I ran the rears super low on pressure so I could accelerate heating the tires up so they were at a better working temp.
This where the debate starts with tire width, diameter, and compounds. Most class regulated racers are going to keep the diameter small so they have better/quicker gearing, and they will settle on a width and compound that will get enough heat so the tire performs as it should.
While its easy to get A6s greasy on a 3400 lbs STi running 4 qualifying laps the is not the case on the FRS.
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