However, having read most of titlesec.pdf (http://www.tex-tipografia.com/archive/titlesec.pdf), I'm even more confused than when I started

Can anyone tell me how to reduce the vertical spacing above/below the chapter number/title whilst retaining all of the other formatting?
I've managed to reduce the vertical spacing. And put the title on a line below the 'Appendix X' part. But the title is still to the right of the appendix bit. Like this:
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Appendix ATitle of the firstappendix in the book
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Appendix ATitle of the first appendix in the book

My titlesec code so far:
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Code, edit and compile here:
\titleformat{\chapter}{\raggedright\huge\bfseries}% global formatting (number and title){Appendix \thechapter}% label: number and its formatting{0pt}% spacing between number and title{\vspace{1em}\\}% optional (content between number and title)\titlespacing*{\chapter}{0pt}% left{1cm}% before{1.2em}% after
Preamble is:
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Code, edit and compile here:
\documentclass[11pt,a5paper,draft]{book}\usepackage{graphicx} % to include postscript graphics\usepackage{wrapfig} % to allow wrapping of text around figures\usepackage{color}\usepackage{multicol} % to allow 3 column pages for long narrow tables\usepackage{xtab} % to allow tables to break over twocolumn (or 3 column) pages\usepackage{titlesec}\usepackage[utf8]{inputenc} %for UTF8 characters (see plbook.sty)\usepackage{plbook} % my style file...\mainmatter\include{chap01}\include{chap02}\include{chap03}\include{chap04}\include{chap05}\include{appendix}...
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Code, edit and compile here:
\setlength{\parskip}{\bigskipamount}\setlength{\parindent}{0pt}\setlength{\topmargin}{-0.5in}\setlength{\headheight}{0.2in}\setlength{\headsep}{0.2in}\setlength{\topskip}{0in}\setlength{\textheight}{9.6in}\setlength{\footskip}{0.8in}\setlength{\footnotesep}{0.2in}\setlength{\textwidth}{6.2in}\setlength{\oddsidemargin}{0in}\setlength{\evensidemargin}{0in}
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Code, edit and compile here:
% Included in book.tex% appendix.tex%\begin{appendix}% from \usepackage{titlesec}\titleformat{\chapter}{\raggedright\huge\bfseries}% global formatting (number and title){Appendix \thechapter}% label: number and its formatting{0pt}% spacing between number and title{\vspace{1em}\\}% optional (content between number and title)\titlespacing*{\chapter}{0pt}% left{1cm}% before{1.2em}% after\input{app01}\input{app02}\input{app03}\end{appendix}
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Code, edit and compile here:
\chapter{Appendix Title}\setlength{\columnsep}{0.2in}\begin{multicols}{3}\small\renewcommand{\arraystretch}{1.2}\begin{tabular}{cl}...\end{tabular}\hspace*{-0.9in}\begin{tabular}{cl}...\end{tabular}%\hspace*{-0.1in}\begin{tabular}{cl}...\end{tabular}\end{multicols}