Need advice re; text and lyrics combination(s)

[Jay Hamilton]

Hello- I have played around with spacing in lyrics with underlines and that 
didn't work very well.  In the example below if I increase the lower spacing 
for the text the lyrics lower accordingly.  What suggestions does anyone have 
to get the two lines to be together so the words attached to both notes and 
rests line up better.
\version "2.10.25"
\header {
 title = "Tunnel Piece"
 composer = "Jay Hamilton"
   copyright = \markup { \tiny \override #'(baseline-skip . 0.5)
\center-align
       {  "CC lic 2.5 some rights reserved Jay Hamilton 1989"
   "see http://creativecommons.org/licenses/by-nd/2.5/";
              } }
}

fluteMusic =
\relative c'' {
\set Staff.instrumentName = "Singer I"
\set Staff.shortInstrumentName = "I."
\set Staff.midiInstrument = "flute"
\tempo 4=75
\time 6/8
r4^\markup {\tiny \italic "words spoken on rests and handclaps"} es8 des ~ des4 
\override NoteHead #'style = #'cross bes8 bes^\markup { \hspace #0 \raise #1.5 
\bigger \bold "In Position at the middle of the Tunnel" }\revert NoteHead 
#'style r4_\markup {\center-align {\hspace #0 \lower #3 "RACK"} }\override 
NoteHead #'style = #'cross bes8 bes \revert NoteHead #'style r4 es8 des ~ des4
\override NoteHead #'style = #'cross bes8 bes \revert NoteHead #'style  
r4_\markup {\center-align {\hspace #0 \lower #3 "RACK"}} \override NoteHead 
#'style = #'cross bes8 bes \revert NoteHead #'style
}
fluteLyrics = \lyricmode  { 
ay oh rack_  a rack_  a ay oh rack_  a rack_ a
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

}
\score {<<

  \new Voice = "flute"  \fluteMusic
  \new Lyrics \lyricsto flute \fluteLyrics
>>
\layout { }

}

Thanks
Jay

Jay Hamilton
www.soundand.com
206-328-7694