i use the GT1 all the time, as for most drift cars all you really need to do is lower the spring rate to about 5-10% of their stiffness capacity, also lower the dampers to 3 or 4 all around, camber/toe really don't make a difference if you already know how to drift, soft springs will let your car sway and transition very smoothly, stiffer springs are more likely to give you that "snap back"