Troubles customizing the ToC with tocloft

I’m having difficulties in setting up the ToC of a large book with many chapters, sections and subsections. The horizontal spacings aren’t right, and the dots to the page number isn’t right neither. Here’s a MWE showing the troubles:

documentclass[11pt,twoside]{book}
usepackage[T1]{fontenc}
usepackage{lmodern}
usepackage{microtype}
usepackage[total={6.25in,10in},left=1.25in,top=0.5in,includehead,includefoot]{geometry}
usepackage{lipsum}

usepackage[titles]{tocloft}
    renewcommand{cftdotsep}{2}  %  Points spacement.
    makeatletter  % To fix a small offset with page number.  TO BE FIXED!
    renewcommand{@pnumwidth}{2.3em} % {1.75em}  TO BE FIXED!

    % Chapter spacement:
    renewcommand{cftchappresnum}{chaptername }
    renewcommand{cftchapaftersnumb}{newline}
    setlength{cftchapindent}{0pt} % Spacement to left of chapter number.
    setlength{cftchapnumwidth}{0pt} %

    % Sections spacement:
    renewcommand{cftsecpresnum}{hfill} % ??
    renewcommand{cftsecaftersnum}{~} % Appears to be too short.  TO BE FIXED!
    setlength{cftsecindent}{11pt} % Random number?  TO BE FIXED!
    setlength{cftsecnumwidth}{32pt} % Random number?  TO BE FIXED!
    addtolength{cftsecnumwidth}{8pt} % ??

    % Sub-sections spacement:
    renewcommand{cftsubsecpresnum}{hfill} % ??
    renewcommand{cftsubsecaftersnum}{~} % Appears to be too short.  TO BE FIXED!
    setlength{cftsubsecindent}{56pt} % Random number?  TO BE FIXED!
    setlength{cftsubsecnumwidth}{48pt} % Random number?  TO BE FIXED!
    addtolength{cftsubsecnumwidth}{12pt} %  ??

begin{document}

frontmatter 

tableofcontents

mainmatter

chapter{Chapter Title}
setcounter{page}{12}
lipsum[2-4]
section{Section Title}
lipsum[2-4]
subsection{Subsection}
lipsum[2-4]
section{Section Title}
lipsum[2-4]
subsection{Subsection}
lipsum[2-4]

chapter{Chapter Title}
setcounter{page}{850}
lipsum[2-4]
setcounter{section}{12}
section{Section Title}
lipsum[2-4]
setcounter{subsection}{15}
subsection{Subsection}
lipsum[2-4]
section{Section Title}
lipsum[2-4]
subsection{Subsection}
lipsum[2-4]

setcounter{chapter}{12}
chapter{Chapter Title}
setcounter{page}{1311}
lipsum[2-4]
section{Section Title}
lipsum[2-4]
subsection{Subsection}
lipsum[2-4]
section{Section Title}
lipsum[2-4]
subsection{Subsection}
lipsum[2-4]
setcounter{subsection}{14}
subsection{Subsection}
lipsum[2-4]
setcounter{section}{15}
section{Section Title}
lipsum[2-4]
setcounter{subsection}{12}
subsection{Subsection}
lipsum[2-4]
subsection{Subsection}
lipsum[2-4]
subsection{Subsection}
lipsum[2-4]
subsection{Subsection}
lipsum[2-4]
subsection{Subsection}
lipsum[2-4]
subsection{Subsection}
lipsum[2-4]

backmatter
pagestyle{plain}

end{document}

Preview, with troubles shown in red:

1. As the picture shows, there are some extra dots on the right side. How to fix this? I need a constant spacing between the last dot and its page number, or all the dots should be aligned (whatever the page number).

2. The spacing looks a bit too tight between the section/subsection title and its number. What should I use instead of {~} ?

3. The spacings to the left margin appear to be random and I don’t know what numbers I should use there, for a book that uses 11 points fonts. Currently, I used funny looking numbers by eyes only (11pt, 32pt, 8pt, 56pt, 48pt, 12pt ??). I need help there.

---

EDIT: About the dots problem, the microtype package appears to be the cause of the extra dots. A simple solution is given there: How can I make the dots in a ToC end at the same place?

% tocprob.tex  SE 557386

documentclass[11pt,twoside]{book}
usepackage[T1]{fontenc}
usepackage{lmodern}
usepackage{microtype}
usepackage[total={6.25in,10in},left=1.25in,top=0.5in,includehead,includefoot]{geometry}
usepackage{lipsum}

usepackage[titles]{tocloft}
    renewcommand{cftdotsep}{2.10}  %  Points spacement. % PW changed
    makeatletter  % To fix a small offset with page number.  TO BE FIXED!
    renewcommand{@pnumwidth}{2.3em} % {1.75em}  TO BE FIXED!

    % Chapter spacement:
    renewcommand{cftchappresnum}{chaptername }
    renewcommand{cftchapaftersnumb}{newline}
    setlength{cftchapindent}{0pt} % Spacement to left of chapter number.
    setlength{cftchapnumwidth}{0pt} %

    % Sections spacement:
%    renewcommand{cftsecpresnum}{hfill} % ??
%    renewcommand{cftsecaftersnum}{~} % Appears to be too short.  TO BE FIXED!
%    setlength{cftsecindent}{11pt} % Random number?  TO BE FIXED!
%    setlength{cftsecnumwidth}{32pt} % Random number?  TO BE FIXED!
    addtolength{cftsecnumwidth}{8pt} % ??

    % Sub-sections spacement:
%    renewcommand{cftsubsecpresnum}{hfill} % ??
%    renewcommand{cftsubsecaftersnum}{~} % Appears to be too short.  TO BE FIXED!
%    setlength{cftsubsecindent}{56pt} % Random number?  TO BE FIXED!
%    setlength{cftsubsecnumwidth}{48pt} % Random number?  TO BE FIXED!
    addtolength{cftsubsecnumwidth}{12pt} %  ??

begin{document}

frontmatter 

tableofcontents

mainmatter

chapter{Chapter Title}
setcounter{page}{12}
lipsum[2-4]
section{Section Title}
lipsum[2-4]
subsection{Subsection}
lipsum[2-4]
section{Section Title}
lipsum[2-4]
subsection{Subsection}
lipsum[2-4]

chapter{Chapter Title}
setcounter{page}{850}
lipsum[2-4]
setcounter{section}{12}
section{Section Title}
lipsum[2-4]
setcounter{subsection}{15}
subsection{Subsection}
lipsum[2-4]
section{Section Title}
lipsum[2-4]
subsection{Subsection}
lipsum[2-4]

setcounter{chapter}{12}
chapter{Chapter Title}
setcounter{page}{1311}
lipsum[2-4]
section{Section Title}
lipsum[2-4]
subsection{Subsection}
lipsum[2-4]
section{Section Title}
lipsum[2-4]
subsection{Subsection}
lipsum[2-4]
setcounter{subsection}{14}
subsection{Subsection}
lipsum[2-4]
setcounter{section}{15}
section{Section Title}
lipsum[2-4]
setcounter{subsection}{12}
subsection{Subsection}
lipsum[2-4]
subsection{Subsection}
lipsum[2-4]
subsection{Subsection}
lipsum[2-4]
subsection{Subsection}
lipsum[2-4]
subsection{Subsection}
lipsum[2-4]
subsection{Subsection}
lipsum[2-4]

backmatter
pagestyle{plain}

end{document}