Vertical alignment of lines change based on letters having a descender or tail

Question

I am currently having issues with vertial alignment based on the type of character being inputted. If I use a character that has some sort of descender or tail, it adjusts the height of the \hrule that appears under the text. This can be seen in the image below, in which the p of pppaaa is shifting the \hrule.

To create this, I am using a small custom command which is the following

\newcommand{\customHeading}[1] {
    \begin{flushleft}
        \LARGE{#1}
    \end{flushleft}
    \hrule height 1.5pt
}

Now, I could just use a \vspace{...}, in which I pass a custom spacing parameter for each new \customHeading but that seems a tad hacky. I was hoping there would be a better way of adjusting the alignment, in which I am open to suggestions!

Note - I looked at the following question, but using those ideas, I couldn't really fix my issue.

Answer 1

I managed to produce something that looks a lot better, based on all the comments from above! It now looks like the following, in which everything is aligned as expected.

This was produced with the following snippet

\newcommand{\customHeading}[1]{
    \noindent\smash{\LARGE #1}
    \strut
    \hrule height 1pt
}

This could probably be improved further, if you replace \hrule with \rule, but the above worked for me so I kept it as is.