Clashing note columns

[Kris Van Bruwaene]

I am typesetting a choral piece wich has two voices coming in unisono on a
single staff, one with a whole note (g1), the other with two half notes (g2
g2). The whole note and the first half note clash at the start of the
measure. I tried to avoid the clash with the remedies given in the Lilypond
manual:
1) \once \override NoteColumn #'force-hshift = #2.7 g1
to shift the whole note to the right in the measure; no effect. And
2) in the lyrics:
{ al -- le -- lu -- \once \override LyricText #'self-alignment-X = #CENTER
ia } (from Lilypond Snippets Lyrics alignment)
No effect either, probably because the syllable "ia" is too short.  How can
I solve this?

Using Lilypond version 2.14.1 on Arch Linux.
 
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