re: smaller distance between first Staff and TimeSig

[Stefan Thomas]

Dear Lilypond users,
I still have the problem with getting the right distance between first
staff and TimeSig.
In the below quoted snippet, the first staff is not alwys the same.
How can I (if possible,  automatically) control the distance between
TimeSig and first staff?
Here is the snippet:

\version "2.12.1"

\paper {

  ragged-last-bottom = ##f
      system-separator-markup = \slashSeparator

}

 \layout{
  \context {
    \type "Engraver_group"
       \consists "Time_signature_engraver"
    \consists "Text_spanner_engraver"
    \consists "Text_engraver"
    \consists "Dynamic_engraver"
 \consists "Axis_group_engraver"
   \name "TimeSig"
       \override TimeSignature #'font-size = #3
    \override TimeSignature #'break-align-symbol = #'staff-bar
    \override TimeSignature #'X-offset: =
#ly:self-alignment-interface::x-aligned-on-self
    \override TimeSignature #'self-alignment-X = #CENTER
  }
  \context {
    \Score \accepts TimeSig
  }





 \context { \Score \override VerticalAlignment #'max-stretch =
#ly:align-interface::calc-max-stretch }

\context {
\RemoveEmptyStaffContext
}
\context { \Staff
   \remove "Time_signature_engraver"
    % \override VerticalAxisGroup #'minimum-Y-extent = #'(-0 . 4)
  }
  \context { \TimeSig  \override TimeSignature #'extra-offset = #'(0 . 3 )
  }
  \context { \Score \override RehearsalMark #'extra-offset = #'(0 . 4) }
}

%%ENDE Layout!

global = {
\time 3/4  s2.   \mark \default \time 4/4 s1  \break \time 5/4 s4*5
\mark \default  \time 4/4 s1 \break \time 3/4 s2. \time 4/4 s1 }
notenA = \relative { \set Staff.instrumentName = "InstrumentA" \set
Staff.shortInstrumentName ="A" c4 e g c1 R4*9 c4 e g c1}
        notenB = \relative  { \set Staff.instrumentName = "InstrumentB" \set
Staff.shortInstrumentName ="B"
        R4*7
       c2 c4 e g c1 R4*7 }
        notenC = \relative {\set Staff.instrumentName = "InstrumentB" \set
Staff.shortInstrumentName ="C"
        R4*7 R4*9
         c4 e g c1  }
instrumentA = \new Staff {  \notenA  }
instrumentB = \new Staff { \notenB  }
instrumentC = \new Staff { \notenC  }
tempotakt = \new TimeSig

      { \override Score.TimeSignature #'style = #'( )  \global }
\score { <<
\tempotakt
\instrumentA
\instrumentB
\instrumentC
>> }

timesigtest.png
Description: PNG image