With everything that you've done, you've eliminated quite a bit. I'd try two things that won't cost you any more.
1. Get the rear wheels with tires in the front, and the fronts in the rear. If there is some wheel vibration you'll feel it go from front to rear. Even if the offset is a little off a short drive won't cause too much issues.
2. When you have the car jacked up, check the wheel bearing. All you have to do is move the wheel around to see if there's any play without having to use force to move the steering wheel.
Bonus: While you have your wheels off check the tie rods and end links as well.
Keep us posted!
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