Fyne 301 has a really uneven response throughout the range, and treble isn't elevated, some mids are dipped.
And I'm sold more by research of Floyd Toole and Sean Olive. ASR and Amir just pointed out to those. With a response like the above, the circle of confusion is so big. There's no certain frequency that if you boost voices will sound better, as there's a wide variation in human voices. Some will sound better, some worse.
Again, I would refute you point by point, but instead, jsut read Floyd Toole's book first. It's available for free if you'll Google it. I can link if you want. Most of your points are covered by actual research done by industry pioneers.