Warren,
I feel like this is the kind of thread that can help people gain useful information. Hopefully it will do that.
There are too many variables to answer "what should my tire pressure be?" When I was trying to figure it out for my car I got a lot of conflicting information and opinions. There are so many different car and tire combinations that the range of answers wasn't really useful. As others have pointed out, our cars are light and that is an important factor.
Here is one of the articles I came across that I found helpful:
TurnFast! Race Driving Techniques for Heel Toe Downshift, Driving Line, Cornering, Braking, and More • Tire Pressure 1
That was the article that prompted me to purchase a tire pyrometer. Knowing the temperatures seems to be the most accurate way to get the pressures correct. And getting tire pressure correct is important on the track so hopefully more people with knowledge will weigh in here.
John