405 Sri 2.0 Suspension

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hello there, ive been facing a problem with my front suspension on bumby roads when i go over sudden broken part of the road at a speed of 60 km a horrible sound comes from the suspension, its a a new suspension the yellow koni adjustables, and they are adjusted to soft, but still it doesnt feel soft on harsh roads, and i have changed the steering wheel box as it was used to make knocking sounds when i steer the steering wheel left and right rapidly, i just want my suspension to give me the same comfort as the 406, could it be the rubbery roundish black thing that is placed above the front suspension i dont know what they call it but culd that be the problem?, my car isnt lowered and i am using standard wheels and tires 195/65/r14