I do proportion valve on front brakes and line lock on rear brakes. This way I match front brake power to equal the rear with bigger tires and the line lock I hit the button 1st, hit the brakes 2nd then only the front brakes will clamp on. This I feel allows a safer burnout as I can control roll out with my brakes and not just expect to roll or possibly launch forward as soon as I let go of the line lock button.