Mike is right, and tyre pressures are very much car specific, and I would advise some experimentation on a test or track day.
I reckon you are running too much pressure, allowing for the fact that the pressure will increase 4-5 psi at least quite quickly.
So many other factors will come into play, from tyre wall flex, corner weighting, castor/camber angles, etc, etc, so I reckon you need to "play" for a day.
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