How to finish this particle decay channel diagram?

[quarkquartet]

I try to finish this diagram.

My code is:

`\documentclass[tikz]{standalone}
\usepackage{tikz}
\usetikzlibrary{decorations.shapes}
\usetikzlibrary{patterns}
\usetikzlibrary{snakes}
\usepackage{tikz-feynman}
\begin{document}
\tikzfeynmanset{
every blob/.style={draw=black!40!black, pattern color=black!40!black},
}
\feynmandiagram [horizontal=a to b]{
i1 [particle=(p)]-- [fermion] a -- [fermion] i2 [particle=(p)],
a -- [boson, edge label=(Z^{\prime}\ Z\ \gamma)] b ,
c -- [fermion,edge label=(\bar{E})] b -- [fermion,edge label=(E)] d,
d -- [fermion] e [particle=(e^{-})],
c -- [fermion] f [particle=(e^{+})],
c -- [scalar, edge label=(\phi_{R})] g -- [scalar] o [particle=(\phi_{L})],
d -- [scalar, edge label=(\phi_{R})] h -- [scalar] n [particle=(\phi_{L})],
l [particle=(\bar{f})]-- [fermion] h -- [fermion] m [particle=(f)]，
j [particle=(\bar{f})] -- [fermion] g -- [fermion] k [particle=(f)],
l -- [draw=none] j
};

\end{document}
`

The result I get is:
Decaychannel.pdf
It looks not symmetric, and the labels for the two closest final state fermions are overlapped. Any solutions?