Patrick, you also may have accidentally skipped over Fred "The Truth" Bush's Rochester A when compiling the list of at-large teams. -Adam Now that's one nickname for Fred I had not heard before, perhaps I'll have our team webmaster add it to his profile if we ever update that section agai...
Based on the NAQT website and what they say they use, one thing I would change in your calculation is giving a heavier weight to Winning Percentage instead of giving it an equal weight with the other components.