Don't overlook rear problems. Maybe one brake is dragging or the e-brake is sticking. I have a simliar problem. My car seems to pull left slightly with new MXV4 on new dealer rims. The car feels like its going crooked unless I put snows on the rear, then it seems better. With all MXV4+ front & rear the handling is sloppy. When I find out why I'll let you know. Simply rotating the rear tires and front tires around does not seem to change the problem...