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I experienced a similar issue: a persistent shake above 60 mph, peaking around 70 mph, accompanied by noticeable steering wheel oscillation. I had the balance of both front wheels checked twice, but no adjustments were required.
Assuming alignment was the next logical step, and given the advanced age of my front struts, I decided to replace the struts, bearings, and control arms before proceeding with an alignment. This improved the shaking by about 80%, and the noticeable oscillation disappeared.
When I switched to my winter wheels, the shaking stopped entirely.
Before spring, I plan to visit an alignment shop that offers a road force alignment test. This test can identify imbalances in the wheels and tires, potentially allowing the technician to "clock" the tire on the wheel to bring the imbalance within an acceptable range.
I’m also considering trying balance beads.
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