That phrase and "knock on wood" appear a lot in all the threads where the DCT is discussed.... Keeping my fingers crossed that it doesn't come back to bite me!
Over the past 5 or 6 years I've crossed my fingers a lot for others like you who have taken a chance on the Focus DCT, but I don't think it has helped. From what I've read, getting the custom tune from Tom is more likely to get you a good result.
Kudos for taking the time to inform yourself in advance and for sharing your thinking. [thumb] I hope it will turn out OK for you and your son and daughter. (Do they appreciate your effort in this area?)