When you say rides 'strange', what exactly do you mean?
I had Bilstein HD's put on my rear about 6 months ago. I'd be anxious to share experiences with you.
I put them on my 420 SEL, which benefits from rear-end help. Rear end handling is dramatically improved - especially above 70. In fact, above 80, the control for a car of this size is intoxicating.
Yet, they do rebound quicker than the comforts. And this is probably what you're noticing. And you will feel more road at low speeds.
Looking forward to your reply....