To check ball joints the front of the car should be resting on jack stands. Then use a floor jack under the end of the control until the vehicle just starts to lift off the floor jack. Then use a pry bar between the ground and the bottom of the tire and see if you get any movement at the ball joint.

Vibrations are caused by thing rotating, and looseness in parts will transmit vibrations. Even if the tire is "perfectly" balanced road feel can be transmitted thru the front suspension and if there is looseness you'll feel it.

Wheel bearings are set to 0.01-0.02 mm play. There are a few hueristics that can be used to get there. One is that the washer behind the lock screw should be somewhat stiff, but should turn with a screwdriver. Rocking the wheel at 12 and 6 and there should be a very small amount of play.

I'd check you front end again, make sure the wheel bearings aren't too tight. Rotate the tires to see if you can isolate the problem.

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Brian Toscano