Fuel temperature limits when jp4 and jet b fuel are used
In the Airbus 320 FCOM in the limitations chapter it says:
"If the Wing Fuel Temperature exceeds 30ºC at engine start, the altitude must be limited to 35000ft, until center tank is empty “. As it is in the tittle WHEN JP4 and JET B FUELS are used.
My question is: If the center tanks are already empty before take-off with FL should you climb? Is the OPTIMUM, or limit to FL350, until the fuel cools down? What is recommended?