There is something wrong with this car. It could be any number of things including rear suspension bar links, front suspension problems, shocks or tires.
There is no company that puts more importance on aerodynamic crosswind stability than MB. For many years, their wind tunnel crosswind parameter that must be met has been 50 MPH crosswind.
This is the reason for the top being inset downward a fraction of an inch. This breaks up the crosswind air flow that is the biggest cause of crosswind instability.
Good luck finding the problem.