One thing to notice if you have not. HD radio has sub channels on many stations. You can access it when tuned to the station, by clicking on the HD icon, but it is a bit of work. One trick, if you like all the HD substations is to add each one to favorites, then you can scroll through them easily (95.1-1, 95.1-2, 95.1-3 for example).
One rock station i listen to broadcasts on 100.1 analog and HD. but it also has a 100.1-2 that is alternative rock (HD only) so i added both to favorites as it is faster then trying to flip back and forth using the on screen menu when on 100.1 .