From your description I think that worn parts are the chief culprit. On a rear drive car a slight amount of toe out can help on an autocross course, but will cause the car to wander or be "darty" in anything like normal driving. You MUST fix or replace any and all worn parts before you can expect decent handling. Lower control arm bushings are a bit of a PITA, but necessary. Strut rod bushings are easier and very important since they are critical to maintaining proper toe. Once this is done set camber to 1/2 degree negative, castor to at least 2 degrees positive [ 3-4 ] is better, and 1/16- 3/32 toe in. Also keep in mind that when using wider wheels and tires that offset [ backspace ] can also affect handling. If the centerline of the tires is farther out [ away from the centerline of the car, basically a wider track ] than stock this will increase the scrub radius. Increasing the scrub radius besides causing the tire to drag slightly in a turn also causes an effect similar, but not identical to bump steer.