The minute you get off track level the tires off. You will never have the same pressures at first on all 4 corners. Certain tires get worked more then others. So using your example level them all down to 12.5 hot. When they cool they may have 4 different pressures, that’s ok. Now next session they will all heat up to 12.5 (barring any crazy weather changes) . Now you can adjust the pressures to suit the drivers/karts needs. Do that cold by either adding or bleeding down all 4 tires by the desired amount. Hope that made sense. That should get you rolling…
