My amp is the Pathos Classic Remix, a tubed hybrid. Certainly not a bright sounding amp. The speaker cables are bi-wired silver Grover Huffman cables. Note that I didn't have this issue with the Castle Edens using the same equipment upstream.
There's certainly a lot of musicality going on. The rest of the frequencies, from the midrange on down, have gotten less tight and more expressive. The speaker is quite liquid when not pushed. The speaker sounds natural and engaging. But when pushed, the top end gets tense and hard, and sticks out from the rest of the presentation.
I'll say this, in that when I first got the speakers, the top end sounded really confused, no focus at all. That is not the case now. It's pretty concise. It's just not relaxed. It's like I'm almost listening to two different speakers with certain kinds of music. With the tweeter taking on more of the frequency response, it seems to be taking longer for the frequencies they're handling to unify.
From the next room, I can hear the life in these speakers. It sounds like real music being made. But I can occasionally hear the hardness up top when pushed. With such ease coming from the rest of the speaker, it makes the top end stick out at that point.
Thanks for the input!