I actually think I have the same issue...
steering rack was replaced in the beginning of September.
It pulls to the right just the slightest bit when driving...but not all the time. It is hard to duplicate because while driving on the same road numerous times it may or may not happen.
When accelerating from a stop and applying the brakes quickly I too have a pull in the steering wheel...
I am possibly going to bring my focus to the dealer by the end of the week so I will let you know what happens if I do.
edit: I do not have a vibration in the wheel or any clunking from the transmission.
Mods: Drop in K&N filter, Steeda RSB, MS3 RMM, Remote start, Llumar tint, Ti engine cover, Husky floor mats, OEM splash guards