bars not equally spaced on one line

[Tao Cumplido]

Hi,

in the code below the the bars of the second system aren't equally spaced as 
soon as I put text indications.
Is there a way to fix this?

I use 2.11.45 on Win XP.


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

play =
{
        \override MultiMeasureRest #'stencil = #ly:multi-measure-rest::percent
        \override MultiMeasureRest #'thickness = #'0.68
}

noPlay =
{
        \revert MultiMeasureRest #'stencil
        \revert MultiMeasureRest #'thickness
}

drKicks = \drummode
{
        s1*8 \break
        s1*0^"cascara"
        s1*8
        s1*0^"mambo bell"
        s1*8 \break
        s1*8
}

drSlash = \drummode
{
        s1*8
        \play
        R1*8
        R1*8
}

dr =
{
        \time 2/2
        << \new DrumVoice { \drKicks } \new DrumVoice { \drSlash } >>
}

<<
        \set Score.skipBars = ##t
        \new DrumStaff \dr
>>
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