Tire pressures -- starting point - new setup

Tedmeister

On the same size set-up I start at 25 psi with 200 utq compound tires.

Question: What tire psi are people starting with on slicks?
I ran 305-660-18 slicks square, for the first time this past
weekend, but with the softer sidewall, I wasn't sure if I should start
with a higher psi or not. I started with 27 psi all around, and while my
times were 2 seconds faster per lap, the set-up seemed really soft.