Which longacre for bump steer

Living in northern Alberta our roads/ highways see a crazy amount of heavy traffic and freezing months creating less then desirable driving conditions. The biggest thing I notice is when I go over an old frost heave that hasn't settled. When I go over one naturally the car goes up ( steering pulls one way or the other ) then the car goes down ( steering pulls the opposite way ). I also notice if I hit a pothole with one tire, car will pull the same direction as to which tire hits hole ( hit with left tire, car will pull left, visa/ versa )