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The following does not yield squared arrow lines. The lines connecting the two lower blocks are crooked. Does anyone have any idea how to fix that?

Thanks, Dave

\usepackage{tikz}
\usepackage[all,cmtip]{xy}
\xymatrix {
        {\scriptsize\begin{array}{ll}z\\~\\~\end{array}}
    &
    &   *+++++[F]{G}    \ar@<-9pt>[ll]
                        \ar@{->}`l/0pt[ld]`[d]_{y}[d]
                        \ar@{<-}`r/0pt[rd]`[d]^{v}[d]
    &
    &   {\scriptsize\begin{array}{ll}w\\~\\~\end{array}}            
                        \ar@<-9pt>[ll]
\\
    &
    &   *+++++[F]{K}    \ar@<+9pt>@{->}`l/0pt[ld]`[d]_{x}[d]
                        \ar@<-9pt>@{<-}`r/0pt[rd]`[d]^{u}[d]
    &
\\
    &
    &   *++[F]{Q}
    &
}

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