If the ball joints and control arm bushings are original and you've already replaced everything else, go ahead and replace them too. It may not be the direct cause of your problem, but they certainly are not helping.
I agree with 69lm69gp, 90% of vibration problems come from tire/wheels. If your suspension is loose you may be getting uneven wear patterns in the tires thus causing the vibrations.
When you replaced the wheels/tires, was there any improvement?
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