Left aligned InstrumentNames (2.7.35)

[Andrzej Kopec]

How to produce left aligned instrument names in the (almost) newest lily?
I have done it this way (so far):

\new Staff \with { 
  instrument = \markup {  \override #'(line-width . 14)  \fill-line { \vcenter  
"Fagotto"  " "} }
 }
...
\new Staff \with {
  instrument = \markup {\override #'(line-width . 14)  \fill-line { \vcenter 
"Violini"  \vcenter "I" }}
 }
... 


but problems are with a few system-start-delimiters at once. InstrumentNames 
are shifted a
little to the left (due to width of the brace/bracket). In this ok (BTW 
v.cool:), but makes me
unable to ideally left align instrument names in this way. 

So question is: how to left align instrument names? I can't find out how to do 
it?
self-alignmet-X seems not to work...

TiA,
/ak/