Reduce the gap between time signature and the first note

[Paolo Prete]

Hello,

I'm trying to have a minimum space between a TimeSignature and the first note after it (and, consequently, all the following notes). I tried: 

    \once\override Score.TimeSignature.space-alist =
    #'((first-note fixed-space . 0))

...but there's still a gap which I can't eliminate. How can I fix it?

Thanks

P

%%%%%

<<
{

c'1

\time 3/4

\once\override Score.TimeSignature.space-alist =
#'((first-note fixed-space . 0))

cis'2.\break
s

}
>>

%%%%%