There are two obvious problems that I see. The first one is your very strong signals. WSOC has a Noise Margin of 75.0 dB even before adding your antenna gain and distribution amp gain.
Interpreting Noise Margin in the TV Fool Report
http://www.aa6g.org/DTV/Reception/tvfool_nm.html
Very strong signals can create spurious signals from IMD (Intermodulation Distortion) in a tuner or amp that will wipe out weak signals. More details about overload if you ask me.
The second obvious problem is from your very strong local FM signals that can interfere with TV reception. You need an FM filter or 2 in series.
You can see that the WXII signal barely makes it to your location:
color code here:
http://www.tvfool.com/index.php?opti...id=15&Itemid=1