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Try using chalk. I read about this in a race car setup book (I used to really be into sim racing so I read a lot of engineering and technical racing books)- draw a chalk like on the sidewall of the time from the tread to the middle of the sidewall. At the end of a run, check the chalk line. If the chalk is worn off onto the sidewall, your pressure is too low. If the chalk doesn't wear off on the entire tread area, your pressures are too high.
I do this when I autocross and it helps me dial in the right air pressure. I ended up around 29PSI, but remember in AutoX you do one run, not laps
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