First, I have to agree with others above who caution about changing the OEM design. I am sure a lot of engineering thought went into it. Their engineers probably considered things that you, I, and none of the others here will even think of.
That being said, I find your sketch very lacking for any real analysis. With my limited knowledge of steering mechanisms, I am assuming that the part you call the centerlink is moved left and right by the idler arm pin. And it moves the tie rods (one on each end but only one is shown) which, in turn are attached to arms on the wheels that turn them. But you do not show how that center link is constrained except for the pin on the idler arm. There must be additional constraints on it's motion or it will flop around and never do it's job. These additional constraints will be, MUST be considered in any analysis of the forces involved because they will be supplying some of them. Also some of the critical dimensions of the components, especially the center link, are not given.
From a glance, I think the rotational force you are talking about may not be the biggest problem. By lowering the point of attachment and moving it forward, you are also apply rotational forces on the centerlink that are on axis that are perpendicular to the plane of the drawing and that are vertical in that plane.
Another dimension that is not shown is the length and angle of the arm on the wheel that the tie rod is attached to. This arm rotates about a vertical axis or on an axis that is at an angle to vertical. So the angle of the tie rod will change as the wheel is turned. This angle would not show (very much) in your front drawing so an above view would also be needed.
All in all, there is way too little information to provide any meaningful analysis, even if you do know vector math. To properly analyze this mechanism you would need to know the exact dimensions and angles for it in several positions, not just centered. I would do a minimum of five: full-left, half-left, center, half-right, and full-right. Each of these will present a different mix of the angles involved. Oh, and you will have to consider both wheels and their linkages, not just one because the other wheel will be providing additional forces on that centerlink at the same time.
Hey y'all I've been scratching my head and trying to figure out this problem. A friend has a high horsepower truck and the steering is a week link he is planning to change the tie rod position to lower and straighten the angles but we are concerned that the tie rods being lower will cause rotational force to be applied to the idler arm and center link. Any thoughts on how I can figure this out? Thanks in advance -John