I've looked into this before, and the most honest answer I can give is - it's complicated. It's not a straight forward formula that I can say "oh, it's just X + Y" where I can just to point to something and tell you why the rankings are the way they are, and many times it leaves a lot to be desired when you use the eyeball test on the rankings, like in your case. The Coach's and Press rankings are also very strange as they base the rankings on the past week's rankings to try to simulate real life. If it doesn't get touched in the major update, rankings will probably be the next thing on the list to work on as it's a major source of frustration.