Dear Sarah,
congratulations on the development of your voice. It sounds great indeed. And thanks for the thumbs-up for my (and Saskia's) surgery in April! <3 <3 <3
And your attempt at doing a low voice really supports my conjecture that resonance modification becomes less and less important if the pitch problem is taken care of, as male resonance becomes unmaintainable at higher pitches anyway. Thus it is unnecessary to modify resonance as long as the vibrating weight and/or length of the vocal folds is decreased. Apart from the consistency of their great results, this is the main reason for me to favor Yeson's procedure over any other.
Since it's incredibly hard and abstract to describe my voice in words, I've prepared a little diagram that's supposed to show how my voice feels to me (with 2 decades of resonance modification under my belt, but – as of yet – without VFS). This also explains how the region of male resonance becomes increasingly hard to access as the surgery modifies the vocal cords in such a way that they cannot vibrate at high volume at lower pitches anymore.
You can see that without resonance feminization, the male resonance area and falsetto pretty much exist independently of each other, with significant discrepancies in sound quality. Going from one to the other causes a noticeable break.
With resonance feminized, what used to be the falsetto becomes the new speaking voice, but is extended downward and through resonance modification is given greater power and clarity and less breathiness, and so comes closer to the old male register, which is unused altogether. Volume and clarity are hard to maintain at pitches around where the break used to be (my voice sound quality noticeably suffers in that pitch region). The top minor 6th of the range, however, is crystal clear with lots of volume and control.
The pitch boundaries I highlighted reflect my personal voice. They could be different for other people.
I hope this makes sense to you, as it is quite an abstract visualization. And I'm so curious to find out how this diagram will change after surgery!
Greetings,
Amy