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When trying to pick an EDC setting, I think that you also have to consider the type of tires you have, tire pressures, and the weather.
I drove at VIR a couple of weeks ago with the stock PS2's. As mentioned by others, when the PS2's get hot they become very "greasy". When I was there it was very hot, and I had to reduce cold pressures quite a bit (relative to the recommended pressures, and from morning to late afternoon). I had a few episodes of really severe understeer in turns 1-2 and 4 (I mean the kind of understeer that you experience on a skidpad).
In my experience, in these conditions, Normal mode puts less stress on the tires and gives you more grip. It pushes back the point where the tires overheat and loose grip.
But in cool weather, Sport may work better. Sport also has psychological advantages: for example, it makes the car feel a bit more stable in the esses. Although, if you do 2:19 on the full course, that's probably not a factor.
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