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My sizes are 235/40 18's. i run 32psi fronts and 28psi rears. .32psi all round sound ok. I would say that's not under or over pressure. Its just down to fine tuning for your preference,
For both my 2005 STI and 99 RA I keep the same pressure and that is 33F and 31R as reccommended by prodrive when I got prodrive spring kit fitted a good few years ago.
Remember this is the pressure when the tyres are cold and they will hit around 40 psi with a bit of temprature in them.
Fronts are normally higher as supporting more weight.
if the cars been sitting for any length of time go to 40 plus and behave on your drive then come down to 32 after a day or 2 - this takes the flat spot out