I'd still suspect something else if you've already tried balance 3 times at different shops, all with nice machines.
Since you mention factory locks/lugs, I assume it's factory wheels? Have you added spacers or done any suspension work? Can you characterize the vibration? (Does it seem to come from the front or rear? Only in certain speed ranges? Accel vs Decel vs Steady Throttle vs Coasting in Neutral, etc?).
I assume the tire shops that did the balancing would have looked at the tires and wheels themselves for damage/defect. Hit any potholes or curbs lately? Check tires for bulges from a broken belt or crazy uneven wear patterns from bad alignment?
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