exactly! every dog is different, some need to gain weight, some don't, a few even do best in retirement at less than their race weight. also, different trainers have different ideas of "ideal" race weights, and lastly, some dogs gain weight easily, some don't, so that is a factor as well.
OK, sorry for the lecture , OP, I don't think she looks terrible in any of those pictures, but if she were my dog, I'd keep her at around the 67lb weight.