If it makes you feel better my 85 300D does this.
Aligned and everything. My tie rods are straight, there isn't any weird tread problems on my tires, and the brake isn't sagging on the right tire
I've driven a truly flat pavement before and the problem doesn't happen. On a lot of New England roads they are shaped like this ^ so water rolls off. I'm guessing it is just a weird nuance of the car.