I've lately notice that the wheels FJ40 don't seem to want to return to center after a turn or a curve on the highway. I understand that this is mostly a function of castor, which is set by design at the factory and not adjustable, so I don't really understand why this is happening, unless there is something else I should be thinking of. No wrecks, checked the tire pressure (fine), knuckle lube. Even took off the accessory steering damper to see if that had anything to do with it. Nope. Am I missing something? I don't like the feeling that I'm gonna flip.