[Tex/LaTex] Reducing spacing after headings

line-spacingparagraphssectioningspacing

I've searched many sites but I couldn't get any answer. Here is this mystical question:

How can i reduce the spacing after headings?

Here is my code. 

\documentclass[12pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[turkish]{babel}
\usepackage[left=3.50cm, right=2.50cm, top=3.00cm, bottom=3.00cm,nohead,nofoot]{geometry}
 \usepackage[overload]{textcase} 
\usepackage{graphicx}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{pslatex}
\usepackage[explicit]{titlesec}
\linespread{1.5}

\usepackage{setspace}
\setlength{\parindent}{0pt}
\setlength{\parskip}{\baselineskip}

\addto\extrasturkish{\uccode`i=\string"9D \lccode`I=\string"19 }
\addto\noextrasturkish{\uccode`i=`I \lccode`I=`i }

\titleformat{\section}
  {\normalfont\normalsize\bfseries}{\thesection}{1em}{\MakeTextUppercase{#1}}
\titleformat{\subsection}
  {\normalfont\normalsize\bfseries}{\thesubsection}{1em}{#1}
\titleformat{\subsubsection}
  {\normalfont\normalsize\bfseries\itshape}{\thesubsubsection}{1em}{#1}

\usepackage{chngcntr}

My actual purpose is to set line spacing 1.5 lines. This is a MS Word template that I must use for my project report. When I use \setlength{\parskip}{\baselineskip} with \linespread{1.5} the gap between section headings and paragraphs are huge, so huge it is funny. If I don't use \linespread{1.5} the lines are not spreading as expected. If I don't use \setlength{\parskip}{\baselineskip} this time there is no spacing between paragraphs.

Best Answer

You've loaded the titlesec package- it provides the command \titlespacing which has the format

\titlespacing{command}{left spacing}{before spacing}{after spacing}[right]

From the titlesec package

% spacing: how to read {12pt plus 4pt minus 2pt}
%           12pt is what we would like the spacing to be
%           plus 4pt means that TeX can stretch it by at most 4pt
%           minus 2pt means that TeX can shrink it by at most 2pt
%       This is one example of the concept of, 'glue', in TeX

A complete MWE follows

\documentclass{article}
\usepackage{lipsum}
\usepackage{titlesec}

\titlespacing\section{0pt}{12pt plus 4pt minus 2pt}{0pt plus 2pt minus 2pt}
\titlespacing\subsection{0pt}{12pt plus 4pt minus 2pt}{0pt plus 2pt minus 2pt}
\titlespacing\subsubsection{0pt}{12pt plus 4pt minus 2pt}{0pt plus 2pt minus 2pt}

\begin{document}
\section{Section}
\lipsum[1]

\end{document}
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