I still feel as an overall "best guess" you should have added all the grades up to see who came the closest. That is because I'm pretty good at getting an order "guessed" as a whole.
In fact, your total grades = 51.5
My total grades guess = 51.5
No surprise to me!
I lost however based on the exact guesses. I am a supremely confident and accurate loser!
Thanks for the contest!
Mike