Can't get the layout right

[Christian Bos]

I am working on a piece....



\version "2.12.3"

\include "nederlands.ly"

\header {
  title = "De dag van onze Vorst brak aan"
  composer = "Melodie: Psalm 21 - Loys Bourgeois (1551)"
  arranger = "Zetting: Claude Goudimel (1565)"
}

\paper {
  #(set-paper-size "a4")
}

global = {
  \key d \major
  \override Staff.TimeSignature #'style = #'default
  \override Staff.TimeSignature #'stencil = #(lambda (grob)
    (grob-interpret-markup grob tsMarkup))
  \time 4/4
  \set Score.defaultBarType = ""
}

tsMarkup = \markup {
  \override #'(baseline-skip . 0.5)
  \column { \number 1 \note #"2" #-1 }
}


\score {
 [some music]
\layout {
  \context {
    \Score
    \remove "Bar_number_engraver"
  }
}

  \midi {
    \context {
      \Score
      tempoWholesPerMinute = #(ly:make-moment 100 4)
    }
  }
}

\pageBreak

\score {
  [some more music]
  \layout {
  \context {
    \Score
    \remove "Bar_number_engraver"
  }
}

  \midi {
    \context {
      \Score
      tempoWholesPerMinute = #(ly:make-moment 100 4)
    }
  }
}

#(set-global-staff-size 16)

\paper {  % Start paper block
  bottom-margin = 10\cm
  ragged-bottom=##f
  ragged-last-bottom=##f
  system-count = 3
  indent = 5     % don't indent first system


I want alle the systems to vertically align tot the top, but the two pages act differently.
Wat settings do I need?

Gr.
Christian