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I have no doubt that changing out the OEM bushings will help, but I took the car to Tru-Line (highly regarded alignment/suspension shop here in Seattle) and had them take a look. The tech said the install all looks good. But the dampers just aren't matched on these coilovers - the fronts are a lot stiffer than the rears. This was demonstrated by pushing the frame down in front - the majority of pressure was transferred through the tire which flexed a bit. However the body didn't move much at all (meaning the suspension is very stiff and the tire gives before the shock). However in the rear the opposite was true. With the same pressure applied, the body of the car would bounce up and down with minimal flex in the tire. He suggested that this mismatch in stiffness is what's causing the seesaw at a stop and bouncing on the highway.
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