How do I adjust vertical spacing above \rule line to match that below the line?

Question

I want to know how to adjust vertical spacing above \rule line to match that below the line. I have attempted to solve this problem using the solutions presented for similar questions hrulefill vertical spacing and parskip subsection header spacing, but they do not seem to work for my issue. Below I have provided a piece of output and reproducible code similar to what's used in my document.

Here is some output similar to mine:

Here is the code I used to generate the output above:

\documentclass[letterpaper,11pt,oneside, notitlepage]{article}
\usepackage{relsize}
\begin{document} %starts document
\raggedright%prevents hyphenation, kick words that make line over full to next line
\par\noindent\rule{\textwidth}{0.4pt}
\textit{Technical Guidance Bulletin No. 18 – April 2019}

\vspace{.5ex}
\noindent

\relsize{2}{\textbf{Efficacy of Commercial-Scale Propagation of Native Baitfish in Arizona}}
\noindent\rule{\textwidth}{0.4pt}

\end{document}

Any help is appreciated.

Answer 1

\Shortstack it!

\documentclass[letterpaper,11pt,oneside, notitlepage]{article}
\usepackage{relsize,stackengine}
\begin{document} %starts document
\noindent
\setstackgap{S}{1.5ex}%
\setstackEOL{\\}%
\Shortstack[l]{
\rule{\textwidth}{0.4pt}\\
\textit{Technical Guidance Bulletin No. 18 – April 2019}\\
\parbox{\textwidth}{\relsize{2}\bfseries\raggedright 
  Efficacy of Commercial-Scale Propagation of Native Baitfish in Arizona}\\
\rule{\textwidth}{0.4pt}\\
}
\end{document}