Dali, Amphion, Zu

I own Druids and they are the finest speaker I have heard in 30 years of audio. Can't tell you anything about the other 2 you mentioned but if they have crossovers in them then skip them and buy the Druids. You'll never look back.

How does one become verifiable? What on earth does that mean?
There are a goodly number of posters on here who love their Zus.

It is certainly true that many manufacturers have experimented with elimination of the crossover from their speakers. There have been varying degrees of success but the fact that many attempt it seems to validate the claim that crossovers are best avoided.
Where I feel Zu surpasses previous efforts is in the bandwidth of their midrange driver.
If your Tones have fewer than 200 hours on them, you can certainly look for improvement as they loosen up. I have no experience with the Tone itself but the issue is really with the mid range driver which is the same as the one in my Druids. They improved steadily for months with daily use.

Rblnr-
Call Zu and ask for an extension. I'm pretty sure they'll give you another 30 days. It's not without precedent.
Then it's up to you to play them long and loud. Break in is a pain but the reward is significant.