Wow, it has been a long time since I had my Lightning. Tire pressure was always dependent upon the sidewall of the tires I was running. I generally started off near 40 PSI though. You can do the chalk trick, where you put chalk up the sidewall and over the start of the tread. Play with your tire pressure until you get the amount of roll over you like.
My setup was:
RUSLOW 1200# coild springs
Hotchkis leafs
Hotchkis sways
Hotchkis spec Bilstiens
Carbotech AX6 pads