[Bobcat]

Mickmate ... I`m going to be a smart a$$ here ..... hoiw do you lay rubber with the front wheels ? All wheel drive ?
Seriously , your way works as we used to do that to set tire pressures for drag strip use .
I`ve got the Avons and on the street 26 F and 25 R ... at the track I have to bump them up a pound or two .
A lot depends on how the suspension is set ... i.e , how much negative camber front and rear , toe out , wheel weights , caster etc .
An infra red gun isn`t as much fun as your way , but , with the German police , probably a lot safer !
Roger Krause also has some good tips on his website as to how changing tire pressures can affect a cars`s handling .