In the first round, with human vs. human games, the home teams went 9009-1854 (82.9%). Of those, the 1 seeds won 90.0% of the time while the 2 seeds won 75.9% of the time.
Interesting data, thanks for sharing.
What about the RS? I have the impression that the HCA becomes more important at high levels. In my current series (Div. II) the home teams won 72.2% of the time (127-49), is that a reasonable value for you?