not so nice horizontal spacing

[Stefan Thomas]

Dear community,
is it possible to get a better horizontal spacing in the below quoted snippet?
In my opinion the distance between the 1st and the 2nd drum beat is too large.

\version "2.16.0"
\paper { ragged-right = ##t }

percussion = \drummode { 
\time 5/4
  r4 toml4 tomml tomh r4
  \time 6/4 
 tomml toml r4 r2 r4
}

right = { \clef bass
  r4 r8  <f gis b d' e'>8-. r2 r4 
  R1.
}
left = { \clef bass
  r4 r8  <fis, cis dis>8-. r2 r4
  R1.
}
\score {
  <<
  \new DrumStaff \percussion
  \new PianoStaff <<
    \new Staff \right
    \new Staff \left
  >>
>>
}