Most of the information I have on this came from a series of lectures given by an ex Concorde Flight Engineer ( perhaps he is already taking part in this discussion). According to him, one of the factors which made the possible misalignment of the bogie more critical was the ridge across the runway as it passed from the sterile runway onto the main runway. If this is true, presumably being over weight and down wind, encouraged the pilots to use this part of the runway or maybe they would have done this anyway.