ride heights are pretty good. I Run about what you have listed, however I run a 34 coupe. with a sedan you may be able to go a little lower in the rear, down to 3 3/4 LR and 4 RR, but what you have listed is pretty good. Just depends on feel. If the car seems to roll over to much, lower the rear a tad. If it feels ok, leave em where they are.
Tire pressure I would say ask whoever is cutting them what they recommend. I typically run 20 on the Left and 26 on the right, but your tire guy may suggest something else. One thing I will say is don't adjust the car with air pressures. It takes about 5 psi change to make the same change as 1 round of wedge. set em and keep em at the same pressure. (check em everytime you go on the track to adjust for temp change and buildup from previous runs.)
Also, when you scale the car, make sure you always check the air pressures and fill the fuel tank before you scale it. That is how the car will go on the track, so scale it the same way.
Another tip a lot of guys don't do, is fill the fuel after every run, even if it is only a 8 lap practice. That way you keep the weight the same. The car will get tighter as you burn off fuel, so the more often you keep it full, the more consistent it will be.