decrease subsection \needspace

preamble.tex

@@ -143,7 +143,7 @@ bookmarks=true]%
 {8pt}
 {\Large\bfseries\filcenter}
 
-\titleformat{\subsection}{\needspace{13em}\center\large\bfseries}{}{1em}{}[\rule{.9\linewidth}{.2pt}]
+\titleformat{\subsection}{\needspace{10em}\center\large\bfseries}{}{1em}{}[\rule{.9\linewidth}{.2pt}]
 %
 \titleformat{\subsubsection}
 {\needspace{3em}\normalfont\normalsize\bfseries}{\thesubsubsection}{1em}{}