tuplet brace

[Vivyan]

the following code produces the image I've attached  
<http://lilypond.1069038.n5.nabble.com/file/t5486/Screen_Shot_2018-02-03_at_23.png>
 

the 3's and the braces are just making the score look messy how can I tidy
them up?


\header {
  title = "Composition Study I: Techniques"
  composer = "Joel Ramsbottom"
  tagline = ""  % removed 
}

\layout {
  \context {
    \PianoStaff
    \consists #Span_stem_engraver
  }
}

%Piano Score
{
  \new PianoStaff <<
    \new Staff {
      \clef treble
      \time 5/4
      \tempo "Andante" 4 = 76
      
      des'4
      \tuplet 3/2{
       e'   <e' c'''> ges''
      }
     
    }
    \new Staff {
      \clef bass
      r4
      
      \voiceOne
      \autoBeamOff
       \tuplet 3/2{
        \crossStaff { b} 
      }
     

      d4\rest
      
    }
  >>
}



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