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Front end shake, vibration, shimmy, whatever you want to call it is typically a tire issue. At times it can only be seen if the balancing is done on the car, a method not often used by your typical tire shop. If your tires have been (most likely) balanced and re-balanced off the car, you might poke around and see if you can find someone that can do it on the car.
A couple of other possible contributory tire conditions are out-of-round (relatively rare), and problems with uniformity, a manufacturing defect related to internal stresses caused during the tire building process.
Out-of-round used to be addressed by grinding the surface (usually the shoulders) of the tread, but I don't even know if they do it anymore.
Uniformity problems are uncorrectable, other than by replacement of the tire.
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