Ok, let me try to explain the steering link issue. I've used the picture of Rookie Solara to clarify. I hope you don't mind. One thing to remark is that the angle of the link is a lot steeper than in this drawing. So the 90 degree to the link position of the arm is a lot more forward.
At first look it would seem obvious that the link and arm need to be at 90 degrees. That "looks right".
The reality is different. It is not the link that defines the movement. It's the realtionship of the arm and the servo saver. The link could be a wire tied in a knot or shaped like a "Z" it would not make a difference.
The servo saver moves in a horizontal plane. So ideally the servo arm should move horizontally as well. Unfortunately sevos have no horizontally moving output but a rotating one. So we need an arm. To get left and right movement the same the arm needs to displace itself in both directions the same amount in relation to the movement of the servo saver. This means the horizontal movement is the most impoertant part.
Also you will notice the arm on the servo saver in the neutral position is at a 90 degree angle to the link. That means it you turn left and right the movement (forward and aft, but also left right circular movement) is the same).
So, now look at the picture again. If you align the lever at 90 degrees to the link and turn. If you rotate the arm forward (counterclockwise) you will have a little forward and then (because it is a circular motion) a lot of downward motion. If you turn clockwise, the ball will move sideways mostly and a little up and then down. So in this way both sides have different motions.
If you look at the picture where the arm is vertical in the neutral position you will get the same movement in both sides (horizontal and down).