It could be the alignment fighting against itself. My alignemt needs set in the cordoba. I can feel it steering one way and then the other. It is more noticeable in the wet. Yes, alignment will need done after the suspension has been worked at. Some places do the free alignment check and if it is out you can get them to adjust it. I don't know if you have magowans tyres over there. Jack up the corner that you suspect and check the brake and the wheel bearing for drag.