Ok, took my Atmos Dolby Enabled up-firing speakers out a long time ago back in February. I recently started playing around with it again, without the speakers. Once again, it's flipping the polarity of the center channel speaker when set for up-firing speakers with crossover above 100Hz.
Now the front sound stage degradation seems to be coming from ABC Chicago news but not NBC Chicago. I believe CBS Chicago news was also doing it but can't remember. Therefore, I'm thinking that a mono signal of the voices is duplicated in the front channels which pulls the voices up and to the left from my seating position. NBC Chicago does not do this. This is added DSP manipulation of the signal by the Dolby Processing for these Up-firing speakers. So I'm not using those anymore for sure. I'll just sell those speakers.
What I am going to do now is use some Polk TL1 speakers, same as I have for surround speakers, for Atmos Front Height speakers. I will put them up to my ceiling, on my front wall and aim them down toward the listening position. While not giving overhead Atmos, I should get a taller sound field. I didn't do this from the start as my ceiling is not high enough, nor is my listening position close enough, to get the recommended 30 degree angle from the speaker. After doing a lot of research, even with a lesser degree angle, using front height speakers is the way to go over nothing and even over Atmos Dolby Enabled Up-firing speakers. I thought I would get better from the up-firing speakers and why I went with them initially.
When I have installed the Atmos Front Height Speakers, I will report back with the findings but will likely leave these up even if it's not great as installing them will be a pain and then I'll have wall mounts installed that I don't want to take off leaving behind screw holes.