Controlling markup vertical position

[Menu Jacques]

Hello folks,

I’ve tried to obtain the following from Mozart:

with:

\version "2.19.30"

Cello =  \relative f {
  \clef "bass" \key f \major \time 4/4
  g,2 \f
  -\tweak Y-offset #ly:self-alignment-interface::y-aligned-on-self
  -\tweak self-alignment-Y #2  % move vertically down
  ^\markup{"Bassi"}
  des''4 \p ^"Vcl." ( c4 ) | % 18
}

\relative {
  \Cello
}

but I get Bassi too high and the first quater too much on the left (the \p below the staff is OK for me):

Thanks for your help!

JM