TikZ: Flowchart: Kästen sauber postieren

\documentclass[]{article}
\usepackage[ngerman]{babel}
\usepackage[utf8]{inputenc}
\usepackage{pdfpages}
\usepackage{xcolor}
\usepackage{tikz}
\usetikzlibrary{positioning,arrows,chains,shapes,intersections,calc}

\begin{document}

\tikzstyle{int}=[draw, fill=blue!20, minimum size=2em]
\tikzstyle{init} = [pin edge={to-,thin,black}]

\colorlet{lcfree}{green}
\colorlet{lcnorm}{blue}
\colorlet{lccong}{red}

\begin{tikzpicture}[%
    >=triangle 60,              % Nice arrows; your taste may be different
    start chain=going below,    % General flow is top-to-bottom
    node distance=20mm and 30mm, % Global setup of box spacing
    every join/.style={norm},   % Default linetype for connecting boxes
    ]

\tikzset{
    base/.style={draw, on chain, on grid, align=center, minimum height=4ex},
    proc/.style={base, rectangle, text width=10em},
    var/.style={base, circle, text width=4ex},
    % coord node style is used for placing corners of connecting lines
  coord/.style={coordinate, on chain, on grid, node distance=6mm and 20mm},
    % Connector line styles for different parts of the diagram
  norm/.style={->, draw, lcnorm},
  free/.style={->, draw, lcfree},
  cong/.style={->, draw, lccong},
    jump/.style args={(#1) to (#2) over (#3) by #4}{
        insert path={
            let \p1=($(#1)-(#3)$), \n1={veclen(\x1,\y1)}, 
            \n2={atan2(\y1,\x1)}, \n3={abs(#4)}, \n4={#4>0 ?180:-180}  in 
            (#1) -- ($(#1)!\n1-\n3!(#3)$) 
            arc (\n2:\n2+\n4:\n3) -- (#2)
        }
     }
    }

\node [var] (0) {0};
\node [var, right=of 0] (a) {a};
\node [var, right=of a] (b) {b};
\node [var, right=of b] (c) {c};

\node [var, below=of a] (d) {d};
\node [var, below=of b] (e) {e};

\node [coord, below=of e] (hilf) {};
\node [proc, below=of hilf] (f) {f};

\draw [->,lcfree] (a.south) -- (d);
\draw [->,lcfree] (b.south) -- (e);
\draw [->,lcfree] (c.south) |- (f.east);
%über Kreuz
\draw [->,lcfree,name path=ae] (a) -- (e);
\path [name path=bd] (b) -- (d);
%intersection of tspc and tapr
\path [name intersections={of=bd and ae, by=bd-ae}];
\draw [->,lcfree,jump=(b) to (d) over (bd-ae) by 6pt];

\draw [->,lcfree] (d.south) |- (f.west);
\draw [->,lcfree] (e.south) -- (f);

\node [proc, below=of f] (g) {ggg};
\node [coord, left=of f] (hilf2) {};
\node [proc, left=of hilf2] (h) {hhh};

\draw [->,lcfree] (0.south) -- (h);
\draw [->,lcfree] (f.south) -- (g);
\draw [->,lcfree] (h.east) -- (g);

\end{tikzpicture}

\end{document}

\end{document}