page-limit-inter-system-space

[Richard Shann]

In a multi-movement piece with each movement starting on a new page it
happens by default that if one movement is very short it will be spread
out to fill the page. This can be difficult to read as the systems are
so far apart. I would like to tell LilyPond to limit the space between
systems to avoid this (leaving blank space below the movement).
I've come across page-limit-inter-system-space but can't find the
documentation for it.
I've been testing various values in the following code without success.

8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><

\version "2.20.0"
music = {\repeat unfold 30 c'' }
\paper {
         page-limit-inter-system-space = ##t
         page-limit-inter-system-space-factor = #0.2
       }
\score {
        \music 
}
\pageBreak
\score {
        \music     
}

8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><8><

Can someone suggest how to make these two movements look the same on
the page?

Richard Shann