What Aaron suggested seemed to work with the passage similar to the previous 
rit-a tempo example, but the stretching 8-notes problem arises elsewhere, like 
in the example below.

\version "2.18.2"

pocoaccel = \markup { \italic "poco accel." }

common = {
  \override TextScript.extra-spacing-width = #'(0 . 1.5)
  \override TextScript.extra-spacing-height = #'(1 . 1)
  \override TextScript.staff-padding = #1
  s1 ^\pocoaccel
}

oboe = \relative c''{
  g8 (a b c d) g, (b c) a1
}

\score {
  \new Staff <<\common \oboe>>
}

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