Low 30's is what I run hot for pressures on the V710 slicks, but that is with coilovers. On a stock setup you might need more pressure to prevent rolling the tires over.
For measuring temperatures you are primarily checking for evenness inside to outside. It is okay to have the inside hotter than the outside or the outside hotter than the inside as this will happen when camber challenged. The goal however is to have the middle of the tire temperature fall equally within the two. Alter tire pressure to get the middle temperature in the ideal range.
For most of these DOT slicks the ideal operating temperature is 180-200F. Go too high and they will start to feel greasy.
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