Funny line breaking behavior with time signatures

[ataralas]

I'm using lilypond 2.7.28 on OSX, and am trying to write some rhythm
exercises. I'm trying to number the exercises using "\break \mark" (see code
below) but when I try to force a time signature at the beginning of every
line, I get an extra floating one at the end of every line, as shown here: 
http://www.nabble.com/file/p11945028/test6.pdf test6.pdf .

I also can't seem to get rid of the measure numbers—if I put \Score \remove
Bar_number_engraver in my layout block, the \RhythmicStaff gets overridden,
and I get a treble clef, not my nice rhythm staff. 

Any help would be greatly appreciated,
Asher

----begin code----

\version "2.7.28"

\header{
        title = "Warmup"
}

\layout {
  indent = 0.0\cm
}

\context RhythmicStaff \with{   \remove "Pitch_squash_engraver"}
        { 
       \time 6/8
                <<{\mark \default \autoBeamOff \stemUp{s8 c''8 c''8 s8 c''8 
c''8| s4. c''4
c''8 | s4 c''8 s4 c''8| c''2. \bar "||" \break \time 6/8 \mark \default s4.
c''8 c''8 c''8| s4 c''8~c''8 s4| c''4. s4. |c''4.~c''8 s4| s4 c''8 c''4.
\bar "||"}} \\ {\autoBeamOff \stemDown{a'8 s4 a'8 s4 |a'4 a'8 s4.| a'4 s8
a'4 s8| a'2.|a'8 a'8 a'8 s4.|a'4 s4 a'4| s4. a'4. | s2 a'4~a'4 s2}}>>

        }

----end code----
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