need more smoothness

Once upon a time my rig suffered from tonal hardness (aka distortion) of upper register piano, soprano sax, flute and, as you mentioned, violin. Turns out it was the preamp. Switching from a Forte 44 to a Threshold Fet ten solved the problem across the board. So maybe your speakers are not to blame. Painlessly conveying the tough tones may be a job for finer, less distorting electronics.

Very interesting stuff Cellorover! In my limited experience, I always found that I preferred speakers which turned out to have silk/fabric tweeters. Though that is not to say that metal dome tweeters cannot be smooth, for example the nautilus line with good (smooth) amps.
As for the Finns and their research: do you think we could get them to do the same research with tubes vs ss!

It's a matter of the personal tastes that are currently somehow statistically spreaded throughout speaker manufacturers.
The largest differences heard in speakers in top-end are in tweeter designes. I prefere aluminium dome and someone would prefere soft textile.
I think to agree with Gmood1 that basically you havn't got the speaker you realy want.

I can't believe it. I just went to the Bowers and Wilkens website and that's what they recommend... stick felt on their speakers!

I think anything with a metal dome is sheer pain on the ears. They should keep the material for making cars instead