It could be a bunch of things. Glaze on the rotor is just the most common cause.
The spacers may make things worse but not as much as you might think. Depends on what is causing the vibration.
Check again after replacing the rotors/pads. If the vibration disappears, you can pretty well bet that one of the rotors was the problem.
While you have the rotors off would be a good time to check the steering out. Look for any bent or scraped up parts. Grab everything you can and see if you can feel any looseness.
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