Apple TV 4K + 2x Homepod 2nd gen + Tablo = Low volume?

I just got a pair of Homepod 2s set up in a pair. They are great. Nice and loud.

I notice that when I watch most sources, I have the volume set between 30-50%. That is plenty loud.

However, when watching recordings from the Tablo app, I have to up the volume to like 70-90% to get the same effect. Then, of course, when I switch to a different source, I get blown out of my chair if I forget to reset the volume.

I see a lot of threads about low volume, but I honestly don’t remember this being an issue previous to the Homepods, which is why I’m asking now.

Any ideas? I am recording in Surround 5.1 mode if that makes a difference.