80% of us can run all three (GG,USCA, CAM) now.
I have to do a bunch of math, but I think restructuring the points system would level the playing field without even really changing anything. Run the three existing classes at the finale......_maybe_ add a vintage PT class for a total of 4 classes.
So now you have 4 class winners, AWD, GT2K, GT3K, and PT3K but still no Ultimate Street Car. Those four winners have a hard boiled egg eating contest, most eggs wins!
Kidding about the eggs, but less classes, less rules is still the answer.