If you don't find a good ground for the coax shield using a grounding block, the FM signals can get directly into the TV cabinet, bypassing the FM filter. The FM signals are so strong that even with a good ground you might need two HLSJs in series.
Folded Dipole
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The FM stations would also explain why I can't use an amplifier at all.
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The FM stations would overload a preamp, but you could put the filter(s) between the antenna and the input of the preamp. However, your strongest TV signal WKAS would also overload most preamps and the TV tuner after it.
It is possible to buy a custom filter (expensive) that would attenuate WKAS so that you could use a preamp for the very weak WCHS. Without that custom single channel bandstop filter for real channel 26 to make WKAS weaker, all you can do is use an antenna with more gain for WCHS.
So, you have three issues that are making TV reception difficult.
1. Very strong FM signal interference
2. A very strong TV signal WKAS, that limits your use of a preamp to help you with WCHS ABC.
3. The hill, that makes your desired signals weaker from that direction.
Here is a close up of the WCHS coverage map for your area. Where there is red, the signal is weak. Where there is no color, it is even weaker, which is why WCHS has a NM of -11.1 dB. Any channel with a Noise Margin of less than -10 dB is difficult to receive. If you are able to receive them, you have an excellent antenna system, your tvfool report is wrong, or they have been enhanced by Tropospheric Propagation.
WOWK also has to make it over the hill, but VHF signals can do it better than UHF signals.