Hi mumbo,
I run Pirelli super corsa BSB tyres, I start the day with 30 front and 28 rear psi, this is a starting point, immediately after coming in from the first session I check the pressures, I'm looking for a 5 to 7 increase in PSI any less than 5 I let a little out any more than 7 I add some air ( letting a little out of the tyre at cold will allow the tyre to work harder and increase the psi of the tyre, adding some pressure will act the opposite) since working to this rule it's made quite a difference to tyre wear and handling although it goes hand in hand with a good set up of your suspension.