Compressing mensural notation

[Phil Holmes]

I attach a scan of part of the Ave Regina Caelorum by Dufay, and my initial 
attempt to recreate it.  Generally I'm very pleased, but can anyone suggest 
how to:

* compress the notes more, so they are as close as in the original 
manuscript;
* add stems to all the ligatures as on the original;
* make the stems of the ligatures go up rather than down?

Any help with any of these is welcome.  I attach my code below:

\include "gregorian.ly"
\paper {
 ragged-right = ##t
}


\score {
 \new MensuralStaff \with { \remove "Time_signature_engraver" }
 <<
   \new MensuralVoice = "Tenor" {
     \key f \major
     \tempo 1 = 120
     \override Score.BarNumber #'transparent = ##t
     \override NoteHead #'style = #'petrucci
     {
       \stemUp
       \clef "petrucci-c3"
       c' \breve d'1 \[ e' \longa f' \breve \] d'2 c' e'1 g'1. f'2
       \[ e' \longa
       \override NoteHead #'ligature-flexa = ##t
       d' \breve \]
       c'1
       \[ e' \longa
       \override NoteHead #'ligature-flexa = ##t
       d' \breve \]
       c' \breve
       \divisioMaior
       c' \breve a1 bes2 g2 a1 g \breve g1
       a2 bes2 c'1 bes2 \[ c' \longa d' \] c'1
       \divisioMinima
       c' \breve \[ d' \longa e' \] d'2 f'1 e'2 c' d'1 c'2 a1 bes2 c'1 g1 
a2 bes2 g2 c'1 bes2 c'2 e'2 d'1 c' \longa
     }
   }
 >>
 \layout {
   \context {
   \Score
   \override SpacingSpanner
     #'common-shortest-duration = #(ly:make-moment 32 1)
   }
 }
 \midi { }
}

--
Phil Holmes

SalveRadix.pdf
Description: Adobe PDF document

AveReginaSalve.jpg
Description: JPEG image