Proect format for second page of TOC

[Haines Brown <haines@...>]

I'm migrating a book from pdfLaTeX to LuaLaTeX and have a bit of a 
problem with the table of contents

  \newpage
  \setlength{\cftbeforechapskip}{2.5em} %
  \setcounter{tocdepth}{1}
  \vspace{-1em}
  \tableofcontents
  \setcounter{tocdepth}{1}
  \linespread{1} 

The first page of the TOC has intended line separation of 2.5em. 
However, the second page shows up with a line separation of 1em.

How do I carry the formating fromthe first page to second page of TOC

I tried appending  this line, but it had no effect

\addtocontents{toc}{\protect\cftbeforechapskip}{2.5em} 

-- 

     Haines Brown