Polymetric notation and anacrusis

[milarepa7]

Hello,
It seems that starting by an anacrousis pertubates the polymetric notation,
i just have to comment it in the exemple below so that it becomes allwright
: with the barlines between staves when they're in phase (really cool)
I'm using the version 2.11.36 and didn't found any way to solve the problem
, is there a way to create a new score context in the middle of the piece?
Do you ever know how to solve this?
Maybe I made something wrong.
Thanks for your great job!
Matth 

%%%%%%%%%%%%%%%%%%%%%%%%%

\version "2.11.36"
guitareUne = \relative c'
{ \clef "G_8"
\time 2/4
\key g \major

\partial 16
r16
\repeat "unfold" 16 {c4}
}

guitareDeux = \relative c'
{ \clef "G_8"
\time 2/4
\key g \major

\partial 16
\times 2/3{g32[ a b]}
c4 c c c
\time 4/4
c c c c
c c c c 
\time 2/4
c c c c
}

\score
{
       \new GrandStaff
        {
       <<
       \new Staff  \guitareUne
       \new Staff  \guitareDeux
       >>
       }
\layout {
 \context { \Score
    \remove "Timing_translator"
    \remove "Default_bar_line_engraver"
 }
 \context {
   \Staff
   \consists "Timing_translator"
   \consists "Default_bar_line_engraver"
               }
     }
} 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

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