The factory recommended pressures are based on getting a lot of understeer, which is what most people who change their suspensions are precisely trying to get rid of.
What I have found is that equalising pressure front to rear, or even going with a lower pressure in the rear versus front is the easiest and cheapest way of dialing out some understeer, Look at the Guide to Performance Handling in this link.
Tire Tech Information - Air Pressure for Competition Tires
I generally run 36 square on the street, on the track I run about 4 psi lower in the rear than the front.