Loops in tikz-feynman more circular

Question

I want to draw the diagram I show below (with its MWE), but the loop doesn't look very "circular". Setting looseness=1.7 is the best I can get, but it still a bit oval-like. Is there a way to make it a proper circle? Maybe using some tikz functions would work, but I know nothing about tikz, much less how to mix it with feynman-tikz. Thanks in advance!

\documentclass[11pt]{standalone}
\usepackage{tikz}

\usepackage[compat=1.1.0]{tikz-feynman}

\begin{document}

\feynmandiagram[layered layout, horizontal=b to c]{
    a [particle=\(\mu\)] -- [photon, momentum=\(p\)] b
    -- [fermion, half left, looseness=1.7, edge label=\(k\)] c
    -- [fermion, half left, looseness=1.7, edge label=\(k-p\)] b, c -- [photon, momentum=\(p\)] d [particle=\(\nu\)],
};

\end{document}