Agree with Harry,
Also RCAs should not impact bump steer, as they do not change the steering geometry. As others have written bump steer is caused then the relative arcs of the LCA and Steering system are miss aligned. During suspension travel this caused the wheel to be turned in/out over the range of travel (or bump). The problems with RCAs on the 1200 is they usually are placed above the steering arm (Betwen the steering arm and the strut) thus they do not effect the relative arcs of motion. If the spacer was between the steering arm and LCA it would have an impact.

I guess it is possible that lowering or raising the car may move the static position away from a bump steer "sweet spot", (i.e a spot where the two arcs are closely aligned and as such bump steer is minimal), which may be one reason to add an RCA as a solution. But this is generally not the way to address bump steer issues.