I too suffer from these issues. I dont know if I would explain it the same way but I think we speak of similiar problems. When I drive on the interstate it seems like the car is all over the place. This isnt a small issue as I have never experienced it in another car. Not even my first car (1969 vw bus). What is the deal. New tires don't help. I have made sure of everything in my frontbeing tight. I do notice a noise in the frint end that sounds like something is loose. Do you notice this also? It is almost like a rattling noise when I hit bumps on the interstate or the normal (40 mph) road. Maybe if we work together we can find a solution.

Good Luck

__________________
1998 E320 150,000
1980 300SD 240,000
1965 190D 79,000