Another alignment thread!

I'm not sure what you mean by "over turn". If you mean the steering wheel does not want to return to neutral (straight ahead) position by itself, after completing the turn, that is mostly caster. When you are turning the front end lifts up slightly, and the weight on the front end will want to return to it's lowest position by returning the stg wheel to its neutral position when you release the stg wheel and it spins back in your fingers.
If the caster is insufficient AND/OR the suspension is riding on or very close proximity to the control arm rubber bumpers, this will prevent stg wheel "return".

What I mean is going in to an easy turn, or changing lanes, it hits a point in the steering wheel (very early into the movement, like an inch of steering wheel movement) where it goes from what is expected, to too much and will put you into the turn too quickly or into the lane too fast, as though you are moving the steering wheel too far, too fast.

Yesterday on the way home on a 2 lane road doing 45 into a gentle right hand corner it tried to put me into the inside lane when I went into the turn, and it does the same thing when changing lanes.

I hope that makes more sense