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Things to consider are:
1. Bent wheels
2. Workers competency level
3. Faulty equipment (old, out of calibration, etc.)
I personally watch the guy balance the tires every time to
a) make sure they don't scratch the wheels, especially around the center bore and
b) to make sure the guy is balancing the wheels properly and placing the weights at the right location
Keep in mind that a lot of these shops hire almost anybody to this work. So you must watch what they are doing. Usually I can tell the guys competency level just by the way he holds the tire.
In your case I am leaning towards bent wheels, especially that it's two (probably pot hole damage from the same side of the car)
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