Here is a coverage map for WCSH. The NM changes for different heights, the green lines change for different heights, but the colors do not change for different heights. You are on the extreme fringe.
Signals weaker than NM -15 dB are impossible to receive because they are below the Thermal Noise Floor at -15 dB NM. If you are able to receive signals listed as weaker than NM -15 dB, either the tvfool report is wrong or the signal is stronger from tropospheric propagation (Tropo).
Note that only 685 kW ERP out of 1000 kW ERP are sent in your direction because of the directional transmitting antenna.
here is a closeup:
