To me, a wobble at speed is a result of something going bad, I would check all attachment points, i.e. heim joints, and make sure everything is tight. Also, I would check each mounted front wheel for run out and balance, and, that there is sufficient toe in although that would make the car wander and should not cause a wobble.
Good luck and keep us informed as to what you find, you just might be helping someone else out.