Just a quick update . . .
My car has been at the dealer since Friday. They were open minded and listened to what I had to say, but said they hadn't heard of the problem before. The technician drove it, and "couldn't confirm" that something was wrong. Then, the manager of the service department drove it and said something was absolutely wrong with the steering and they had to fix it.
They emailed the engineers at Ford and they are having them replace the steering gear, which sounds like what other people on the board here have had fixed on their cars.
Hopefully this fixes my car. I miss my Focus!