NOTATIO

I don't see clearly the manuscript, is that any sign of the natural on the last note in the cross staff? That should be than SOMETHING...

For me Cb looks as the double diminished 7-chord, very common in the Baroque/Classic with inversions:
https://en.m.wikipedia.org/wiki/Augmented_sixth_chord

(If I see correctly from my tablet...)

While I agree with you qanunji concerning the melism and slurs, the purpose of notation is communication. And since you communicate in so called the Western style, the way of notation should be in accordance to its rules. I have been working with Balkan folklore music and as well the Byzantine chant...

I think it is fine, as well. Follow tisimst's recommendation on sluring, definitely.

It must be a very good reason to have these notes step-down. As a "handwriting" composer I would never do that without a strong purpose, since it is harder to notated it stem-down than just continue as it is. I would definitely use the manuscript version as the True one. A question arises,...

That is very nice, indeed! Now being solely a composer, I have less interest in the harmonic analysis, but in the case I would need for teaching purposes, perhaps learning LP or LaTeX is the way to do it.

And oh yes, I have completely forgotten about this:
http://tex.stackexchange.com/questions/ ... -for-music

tisimst wrote:Other than using a different application/syntax (e.g., LaTeX), I don't see a convenient way around it.

Is it possible to implement Latex in LilyPond as a native language in one, single document?

Oh, I have completely forgotten this. I will need to prin out that thread in the case MM removes it with their forum lock (Smart music forum has completely vanished). Now I remember I used Math magic... it was demo so I completely forgotten about it. Here these two fonts attached. I am not sure how ...

Maybe it is problem with Finale, have you tried using the font in other older versions?
Also, does it print, or just screen zoom problem?