I don’t know what receiver you are using, but most of the HD Radio capable ones also have automatic IF bandwidth adjustment based on signal strength and presence or absence of adjacent-channel interference. On either of my Sangean radios if I tune a relatively strong AM station, shortly after the bandwidth will open up to let the rich treble audio through (non-HD). Perhaps this is what you heard, at points where the signal reached that threshold. It would also mean splatter from 760 WJR and 780 WBBM would need to be comparatively low. If the signal level drops, the IF tightens back up again to remove noise and het whistling.
I have read in the past that some HD Radio receivers can demodulate C-QUAM AM Stereo. My ancient Sangean HDR-1 can do this; the Mono/Stereo status text will change to Stereo even though it shows no HD lock. For whatever reason the audio quality would improve slightly with this. I have that radio packed away in storage.
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