What's the best way to fix these beams and staff spacing?

[Michael Rivers]

Here is the 28th bar of an etude by Rachmaninoff:

\version "2.16.2"

global = {
  \key g \minor
  \time 4/4
}

goUp = { \change Staff = "right" \stemDown }
goDown = { \change Staff = "left" \stemUp }

right = \relative c'' {
  \global
  r32 as,( c fis c'8) \goDown d,,32( es fis \goUp g c es g, es) \goDown bes(
es b' \goUp g c g' es g,)
    \goDown as,( c fis \goUp \clef bass es g c es, c) |
}

left = \relative c {
  \global
  \voiceTwo
  es8_>( fis32 g b c) d,8_> c-> bes4_> as8_> g_> | 
}

\score {
  \new PianoStaff <<
    \new Staff = "right" \right
    \new Staff = "left" { \clef bass \left }
  >>
}


What would be the best way of fixing this output? The space between the
staves is fine for all but this system and one other with the same problem.



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