1) Check your tweak on a twaek station, to make sure your mark isnt off
2) Shim the axle, make sure the tires are equidistant from the centre of the car
3) Make sure there is no binding anywhere
4) Check the bottom of the chassis for black marks/scrapes, that tells you the car is dragging
5) Check your front springs, make sure they arent shot. If one of them is, it could be making the car bottom out when you turn one way