Staff spacing problem with piano centered dynamics

[jimmy2]

After months of work, I just finished setting a long piece for piano, using
the example
LES NÉRÉIDES given in http://lilypond.org/doc/v2.5/examples.html as a
template.
This uses dynamics between the two staves,

\score {
       \new PianoStaff <<
         \new Staff = "upper" \upper
         \new Dynamics = "dynamics" \dynamics
         \new Staff = "lower" <<
           \clef bass
           \lower
         >>...

The problem is that whenever dynamics are present, they tend to create much 
more extra space between the staves than is necessary, leading to very
nonuniform looking
systems (see  http://www.nabble.com/file/p18454033/example.jpg example.jpg
).  I have tried everything  I could find in the documentation and on this
forum which seemed to be relevant, and nothing has had any effect on this
unwanted extra vertical space.   I will greatly appreciate any advice!
--Jim
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