So the tires turn fine in either direction but they just don't center? Try lifting the front end of the car into the air and try to get them to center. It could just be the weight of the car on the ground that's not letting them get all the way back into the center position. The stock servo's just aren't very strong. But yeah I've heard nothing but good things from that radio system that you ordered so you'll be in good shape when you finally get that.