I'll never come close to 1600 pounds in the rear and I can always add a little air if I need to. The problem with that high a pressure is that it makes it very susceptible to lift-throttle oversteer as I found out . I can handle it but not sure the wife can.
Tire pressure has the least effect on body lean of all the components involved. Spring rate is the primary factor followed by sway bar rate then shock absorber valving with tire pressure bringing up the end. The TC has plenty of spring rate and a monster sway bar under the rear so body lean doesn' seem to be a problem. I didn't notice it in the few laps I got to do on the track at Summit Point.
The next time I get to Summit Point I am going to take the pyrometer and check some tire temps. With that kind of pressure I will bet the difference between the edges and center of the tread will be at least 15*