I forgot to mention, not sure if it makes a difference, but all of my channels are broadcast from the same location. There are 4 transmitters, it’s just one of them is much less power than the others:
KBZK - channel 13: 1.8 kW + 10.21 dB gain = 18.9 kW ERP
KUSM - channel 8: 1.8 kW + 9.98 dB gain...