I have had the exact same issue - the bucking is most noticeable in the morning on the way to work and then again on the way home.
Just picked up my car after it's 4th visit. The service department reset the PCM back to what it was when I first got it. It stills does the same thing but it is a little less severe. However, it still has some serious lag when I try to change lanes in rush hour traffic and I am terrified that I am going to get in an accident because the car hesitates. I am hopeful that more and more people are reporting this issue to Ford and that a fix will be forthcoming. Please continue to post with status updates as it helps to hear what other technicians are saying about the issue, especially those who don't give the standard lines. I will give it a couple of weeks and if it doesn't improve, will be taking it in one more time.