Quero aumentar o espaçamento entre linhas para 1,5 (exagerei no código abaixo para 5 espaços). Porém o espaço entre as seções e o texto também aumenta, não quero que mudem. Como posso evitar isso?
\documentclass[12pt,a4paper,oneside,onecolumn]{report}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{graphicx}
\usepackage[left=4.00cm, right=2.00cm, top=2.50cm, bottom=2.50cm]{geometry}
\usepackage{tocloft}
\usepackage{titlesec}
\usepackage{setspace}
\titleformat{\chapter}{\fontsize{12}{0pt}\selectfont\bfseries}{\thechapter.}{0.3em}{}
\titleformat{\section}{\fontsize{12}{0pt}\selectfont\bfseries}{\thesection.}{0.3em}{}
\titleformat{\subsection}{\fontsize{12}{0pt}\selectfont\bfseries}{\thesubsection.}{0.3em}{}
\titleformat{\subsubsection}{\fontsize{12}{0pt}\selectfont\bfseries}{\thesubsubsection.}{0.3em}{}
\titlespacing*{\chapter}{0pt}{50pt}{30pt}
\titlespacing*{\section}{0pt}{12pt}{6pt}
\titlespacing*{\subsection}{0pt}{6pt}{6pt}
\titlespacing*{\subsubsection}{0pt}{6pt}{6pt}
\setlength{\parindent}{0pt}
\setlength{\parskip}{6pt}
\setstretch{5} % I exaggerated this!
\begin{document}
\chapter{CHAPTER NAME}
Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Etiam lobortisfacilisis sem. Nullam nec mi et neque pharetra sollicitudin. Praesent imperdietmi nec ante. Donec ullamcorper, felis non sodales.
\section{SECTION NAME}
Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Etiam lobortisfacilisis sem. Nullam nec mi et neque pharetra sollicitudin. Praesent imperdietmi nec ante. Donec ullamcorper, felis non sodales.
\subsection{SUBSECTION NAME}
Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Etiam lobortisfacilisis sem. Nullam nec mi et neque pharetra sollicitudin. Praesent imperdietmi nec ante. Donec ullamcorper, felis non sodales.
\subsubsection{SUBSUBSECTION NMAE}
Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Etiam lobortisfacilisis sem. Nullam nec mi et neque pharetra sollicitudin. Praesent imperdietmi nec ante. Donec ullamcorper, felis non sodales.
\end{document}