I agree...
How severe is the bounce up and down? Is it violent or does it just keep bouncing after you go over bumps? You might have a bad set of shocks/struts. The bounce typically would come from bad shocks. If the springs are too stiff, the car will behave like a jumping bean. Is there any clunk from hitting the rubber bumpstops?
What is weird is that its all "new" stuff from AM. Plus, its all part of Eibach's package so you would "assume" that the dampers and spring rates would match.
Can you drive it and have someone in a "chase car" take a video of the car behaving over bumps so that we can all see it?