We want minimal rear steer as the car negotiates the turns. A small amount of steer to the left will help tighten the car. If overdone, the car will push. For three-link cars, set the control arm angle so that the front mount is 1/3 of the total travel distance higher than the rear mount. For cars running stiff right rear spring, remember that the travel will be much less due to the stiffness. You must change your trailing arm angles when changing to a stiffer RR spring.