I haven't tried making any morphs yet, so I'm not positive about anything,...but did you move the model in space. I think you can move the points of the head, but I think the points where the neck meets the body need to remain where they are. But like I said, I'm not sure. I know that Glenn had another tutorial that dealt with elongated neck. It seems like you have some variation of that. You might want to look for that tutorial.