Focus steering problem
Please don't accept any explanation that this is a problem you have to get used to. Any unsafe highway driving behavior is unacceptable, even if it is in your word "moderate" This is a fine and great engineered car which should never exhibit any unsafe behavior. As mentioned in my previous post, I had exactly the same problem. Ford test drove it and compared it with other Focus they had in stock. They acknowledged the problem right away and fixed it promptly under the warranty.
I bet Ford will have to make a recall sooner or later on certain serial numbers. However, please don't wait for that. You deserve the best car and you can get it. Don't wait for an accident to happen. So back to the dealership and ask them to test the car under the right circumstances (130 km/h for more than 10-15 minutes) or call Ford headquarters.