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The fact that the bouncing occurs between 45 & 55 mph sounds like a balancing problem. But, you say the tires are new and balanced. Maybe you should rotate the fronts to the rear and see if anything changes - if it does, then you've narrowed it to the wheels.
Ball joints can be checked visually and also you may want to jack up the car and try to wiggle the wheels - they should not move. Also do this to the rear wheels. The rears can be affected by the rubber bushings that get worn as well as rust under the battery which eventually spreads to the suspension.
If you've got original tie rods....they most likely need changing. I put the turbo tie rods on my car which basically stiffened the steering but really did nothing for the ride.
Lastly, check the torsion bars. Theres definately a left and right but I'm not sure what would happen if they were switched. The front torsion bar bushings also wear out but are fairly easy to replace.
Also, do you have Bilsteins on the front and rear or just the front?
Hope this helps..............Vern
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