The ring manufacturors would have the straight dope for thier rings. Think about all the feedback they get from other forms of motor sports. Tons of it! I would geuss the feedback from nascar teams alone would be huge.
Knowing this, i will never try and " reinvent" the wheel. Just do what your particular ring maker says to do.
The only people that would gain much might be class racers, but for every small gain there would most likely be a whole bunch of trials that may have come up short.