Problems with Hairpins

[Antheo]

I am trying to write notes to practice bow pressure on Violin. To practice,
we play the same note with different crescendo/decrescendo patterns.

What i am trying to do is in the image below called "hairpin"
http://www.nabble.com/file/p19847565/hairpin.png 

In Lilypond, I did the following:

\version "2.11.61"
\layout {
    indent = 0.0\cm % remove indent on first staff
} 
waves = \relative c' {
    \override Hairpin #'minimum-length = #6
        % 1. P   <   F 
        \repeat percent 2 { d2\p\< ~ d\!\f }
        % 2. F   >   P
        \repeat percent 2 { d2\f\> ~ d\!\p }
        % 3. P < F > P
        << d4\p { s4 s\< ~ d4\> ~ d4\! \p } >>
        % 4. F > P < F
        << d4\f { s4 s\> ~ d4\< ~ d4\! \f } >>
}
\score {
    \waves
    \header {
      piece = "Waves"
    }
}

but this gives the following result:
http://www.nabble.com/file/p19847565/lily-result.jpg 


Problems are that the first hairpins are too short
The 3rd and 4th are uneven and the tie between the first notes does not
work.

Any ideas how to accomplish that?

http://www.nabble.com/file/p19847565/waves.ly waves.ly 
http://www.nabble.com/file/p19847565/waves.pdf waves.pdf 

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