automatic uppering alternate bracket in case of chord

[Albert Einstein]

In this example (v.2.2.5, win2000)  second bracket of alternate command  
is not at the same horizontal position as first:

\score{ \notes{
\time 2/4
\clef violin
\repeat volta 2{e'4 b'4 e'4 b'4 e'4 b'4 e'4 b'4 e'4 b'4 e'4 b'4 e'4 b'4 
e'4 b'4}
\alternative {
{ \break < e' g' c''>8 <e' g'>16 <e' g'> <e'g'>8 <e' g'>8 }
 { <e' g' c''>4 <c'' e'' g'' c'''>8\accent r8 \bar "|."}  }
}}

The reason is in ``tall'' chord: <c'' e'' g'' c'''>8\accent r8.
Do you know method allowing to align the horizontal position of 
alternate brackets?

Albert