Vertical Text alignment problem

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Hi,

I have some problems with the vertical alignment of text. I tried both the \halign, \lower inside a \markup and explicit offset commands with an \override, but I couldn't get it right. This sample shows the problem in detail. I do want to move the two "gliss." text-strings nearly on top or directly below the glissando itself.

\version "2.14.1"

\score {
    \new Staff {
        \cadenzaOn
        \set Score.timing = ##f

        g'''4\ff\(
        <<
        {    \stemDown
            f'''32[ s256 c'''32 s256 ces'''32 s256
            \override NoteHead #'transparent = ##t
            e''32 s256 d''32 s256 c''32 s256 a'32 s256 g'32 s256 f'32 s256
            \revert NoteHead #'transparent
            d'32 s256 des'32 s256 c'32]
            \stemNeutral
        } \\
        {    \override Glissando #'style = #'trill
            \override NoteHead #'transparent = ##t
            \override Stem #'transparent = ##t
            \once \override Glissando #'extra-offset = #'(-0.5 . 0.0)
            \once \override TextScript #'extra-offset = #'(5.0 . -10.0)
            s16. g''4\glissando^\markup{ \rotate #-10 \italic \small "gliss." } g'8
            \revert Glissando #'style
            \revert NoteHead #'transparent
            \revert Stem #'transparent
        }
        >>
        \times 2/3 { bes4-.\) d-^\> e-^ }
        \once \override Glissando #'style = #'trill
        e->\(\!\glissando_\markup{ \rotate #26 \halign #-2 \lower #-5 \italic \small "gliss." } f'8[ g'--]\)
        \breathe
        \bar "|"
        a'8.[ a'16] ~ a'16[ g' f'( g'])
    }
}

It doesn't want to move as I intend to, it might be a problem wth the anchor, but I don't see it.

Any help is appreciated.

Regards,
Wim.