Front Suspension problems of the 2008 Infiniti M35

2008 M35 base front end alignment. When driving on uneven roads the front end of the car jumps, rattles and slips. It happens constantly and consistently on uneven or freeways with the grooves (California) at 55 plus miles per hour. The steering is so harsh that the car has to slow down or move to more even road. The road does not have to be that uneven for the problem to occur. New tires and front end alignment only partially fix the problem. But the issue is still evident. On rainy days the problem is worse.