I recently moved back to Michigan with my 40 and am experiencing horrible steering pull or wandering. There are severe troughs in the pavement here from all the heavy trucks and frost heave. My only chassis mods are Scout II steering box and my rear springs flipped length wise. There is no lift and the front end geometry is stock other than the steering box. The steering box, intermediate shaft and all hardware is tight. Why am I getting pulled all over the road? Would a steering stabilizer cure this or do I need more castor?