列表项之间的间距不一致

Question

这是我现在拥有的文档（\it、\eit和\sit只是我用于列表项的宏）：

\documentclass{article}

\usepackage{amsmath}
\usepackage[a4paper, margin=1in]{geometry}
\usepackage{graphicx}
\usepackage{setspace}
\usepackage{enumitem} 
\graphicspath{ {./images/} }

\def \sit {\begin{itemize}}
\def \eit {\end{itemize}}
\def \it {\item}
\def \bo #1{\textbf{#1}}
\def \ita #1{\textit{#1}}

\title{AP Psychology Unit 7 Notes}
\author{Name}
\date{\today}

\begin{document}
    \begin{singlespace*}
    \maketitle
    
    \section*{7.1: Theories of Motivation}

    \sit
        \it \bo{Motivation}: desire that is directed towards a specific goal
        \sit
            \it primary needs: needs that are biological (food, water)
            \it secondary needs: psychological (social interaction)
        \eit
        % ...
        \sit
            \it Past experiences: having done something before
            \it \ita{Vicarious experience}: see someone else perform a task and succeed
            \it Social persuation: when others give encouragment
            \it Physiological feedback: how the body reacts; depends on perception
            \it can be subjectively perceived by different individuals, and the perspective can change throughout one's lifetime
        \eit 
    \eit
        
    \end{singlespace*}
\end{document}

到目前为止一切正常。现在，我将在文档末尾添加最后一个（子）列表项：

% ...
        \sit
            % ...
            \it can be subjectively perceived by different individuals, and the perspective can change throughout one's lifetime

            % this is the new item that I added
            \it some new bullet here, maybe make it long enough so that it spans another two lines at the end of the first page
        \eit 
    \eit
        
    \end{singlespace*}
\end{document}

令我困扰的是，当您并排看到这两个文档时，很明显间距不一致，因为新项目符号的添加减少了列表项之间的垂直空间：

有什么办法可以消除这种不一致吗？换句话说，让项目符号具有相同的高度，无论页面上的其他内容如何？ 谢谢你！