Out of MCO, there are very few connections and I rarely get a B, when i do, it is generally a low one. Even on my return flights from places that people might connect, I get A more often than not.
I am not a big fan of serial refreshing at roughly the 24 hour mark, it often takes 5 seconds or more before the screen is ready to try again. I open a window with the NIST clock and click about one second prior, with communications and processing delays, that usually hits pretty spot on at t-24.