unassthetic slurs

[wjm]

Hi,
You wrote:-
++++++++++++++++++++++++
the slurs in bar 2 and 3 are a bit unaesthetic, in my opinion.
Is there a possibility to get a better output whithout tweaking every 
single slur?
++++++++++++++++++++++++
You could try:-

\new Staff { \clef bass
  \time 3/4
  \slurDown
      <fis, c >8( g e'2)  | % 1
      <gis, fis >8( a es'2)  | % 2
      \time 4/4
      <fis, c >8( bes g cis' e'4. cis'8) | % 3
}

provided it fits your original concept, perhaps

Hope this helps
Regards
Bill