Well it depends a lot on the genre and source. Most of the music I could play @ very high volume. But I find a rockband (Hands Like Houses) album on Tidal. And somehow on high volume I notice a small distortion/rattle. But it might be in the recording though. Since I hear it as well on my other headphones. Maybe they used bad microphones to record the heavy instrumental part make it clipping/distort.
Sometimes I wish Head-Fi was more like some other blog sites where the history of the thread was easier to follow.
I saw your post, but I think the issues were being reported by @commonhorse. And I'm definitely not disregarding yours or anyone else's posts. Just my personal point of view - HD800/800S is for me a quiet evening. HD650 or HE1000 is more for my rocking out mode