Too much spacing in front of accidentals

[Rune Zedeler]

Is there a reason why the extra spacing added to make room for the 
accidentals are made "elastic". The example below clearly has way too 
much space before the cis.

\include "paper16.ly"
\score {
    \notes \relative c'' \context GrandStaff {
        \pianoCautionaries
        cisis1
        d16 d d d d d cis d d d d d d8 d
        
    }
}


-Rune