[tomcatfan722000]

Here are Highlands winning percentages, according to the Highlands-Bluebirds.com site, for the various NKY schools that were not previously listed:

Boone County 91.9%
Beechwood 100%
Campbell County 84.7%
Conner 91.3%
Dayton 80.8%
Dixie Heights 88.6%
Holmes 69.7%
Lloyd 79.4%
Ludlow 84.7%
Newport 72%
Pendleton County 100%
Ryle 84.6%
Scott 100%
Simon Kenton 96.2%

So to answer your question, it is Bellevue at 30.4% followed closely by Holmes at 30.3%. Of course, they have only played Bellevue 46 times compared to Holmes 71 times.

That's crazy that the lowest winning percentage is almost 70% sheer domination.