I run 40/32 psi front/rear on my 3300 lb car, so you could probably go quite a bit less on yours. Your tires are pretty tall though, so just reduce pressure until you start rolling onto the sidewalls. That should give you max grip from the tires.
Thanks t.dot. Where have you been? Haven't seen you in a while.
I just bought some coilovers so I'll be moving to STX class when I install them and I'll probably be slower while I figure them out.