[Grey 65]

I would try 25psi at all (4) corners as a starting point.

You also might want to set your rake. I would recommend +0.50" rear. Meaning measure the two main rails at the front and the rear of them. The bottom of the rear end of the rail should be about 0.50" higher than the bottom at the front end of the rail. If it is much higher like +1.00" or more this will make your car prone to snap oversteer...