mylayout.sty (footnoterule not moving with footnote)

\ProvidesPackage{mylayout}

\setlength\paperheight{9in}
\setlength\paperwidth{6in}

\usepackage[cmyk]{xcolor}

\usepackage{geometry}
\geometry{
paperwidth=6in,
paperheight=9in,
textwidth=4.5in,
textheight=7in,
inner=20mm
}

\definecolor{footnote}{gray}{0.2}
\definecolor{footnoterule}{gray}{0.15}

\usepackage[perpage,multiple,stable]{footmisc}

\renewcommand\footnoterule{%
  \begingroup
  \vspace*{\baselineskip}%
  \kern-3\p@%
  \color{footnoterule}\hrule height 0.4pt width \columnwidth%
  \kern2.6\p@%
  \endgroup}

% redefined from footmisc.sty, putting the footnote text in a \footwidth wide minipage
\newlength{\footwidth}
\long\def\@makefntext#1{%
\parindent1em
\noindent
\ifdim\footnotemargin>\z@
  \hb@xt@ \footnotemargin{\hss\@makefnmark}%
\else
  \ifdim\footnotemargin=\z@
    \llap{\@makefnmark}%
  \else
    \llap{\hb@xt@ -\footnotemargin{\@makefnmark\hss}}%
  \fi
\fi
\setlength{\footwidth}{\linewidth}%
\addtolength{\footwidth}{-\footnotemargin}%
\addtolength{\footwidth}{-0.3em}%
\begin{minipage}[t]{\footwidth}\raggedright #1\end{minipage}%
}

% redefined from footmisc.sty, adding a color for the footnote text
\renewcommand\@footnotetext[1]{%
  \insert\footins{%
    \ifFN@setspace
      \let\baselinestretch\FN@baselinestretch
    \fi
    \reset@font\footnotesize
    \interlinepenalty\interfootnotelinepenalty
    \splittopskip\footnotesep
    \splitmaxdepth \dp\strutbox
    \floatingpenalty25000
    \hsize\columnwidth
    \@parboxrestore
    \protected@edef\@currentlabel{%
      \csname p@footnote\endcsname\@thefnmark
    }%
    \color@begingroup%
    \color{footnote}%
      \@makefntext{%
        \rule\z@\footnotesep
        \ignorespaces#1\@finalstrut\strutbox
      }%
    \color@endgroup
  }%
  \FN@mf@prepare
}%