fingering (/w staff-padding) + textscript and script-priority

[Eluze]

in the score below the fingering indication of the first note (fis) can be
written above+near the notehead using \override TextScript #'script-priority
=#205 or higher. if it is 204 or lower, the text appears nearer to the
staff.
how can this be explained? - i would have expected the relation between the
TextScript and the Fingering priority to determine which comes first?!
what's the magic about these numbers? where am i mistaken?

\score { 
  \context Staff {   
    \clef "treble_8" 
                \key e \minor 
                \time 3/4
                \context Voice="top" {
                        \voiceOne
                        \textLengthOn
                        \override Fingering #'script-priority = #10
                        \override Fingering #'staff-padding = #'()
                        \set fingeringOrientations = #'(up left)
                        %
                        \override TextScript #'script-priority = #205
                        < fis'-1 dis'-4 b-3 fis-2 > 2. \arpeggio ^"II - - - - 
-" 
                        %
                        \override TextScript #'script-priority = #204
                        < fis'-1 dis'-4 b-3 fis-2 > 2. \arpeggio ^"II - - - - 
-" 
                        } 
                }       
        }
\version "2.11.62"
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