Monate ausblenden oder grid verschieben pgfgantt

\documentclass[ngerman, numbers=noenddot]{scrartcl}

\usepackage[ngerman]{babel}

\usepackage{pgfgantt} 
\usepackage{lscape}

\newcounter{myWeekNum} 
\stepcounter{myWeekNum} 
% 
\newcommand{\myWeek}{ 
  \themyWeekNum 
  \stepcounter{myWeekNum} 
  \ifnum\themyWeekNum=53 
    \setcounter{myWeekNum}{1} 
  \else\fi 
}

\begin{document} 
\setcounter{myWeekNum}{22} 
\ganttset{% 
  calendar week text={\myWeek{}}% 
}

\begin{landscape} 
\begin{ganttchart}[ 
  hgrid, 
  vgrid={*{6}{draw=none}, dotted}, 
  x unit=.075cm, 
  y unit title=.55cm, 
  y unit chart=.6cm,%y-Abstand 
  newline shortcut=true, 
  time slot format=isodate, 
  bar label node/.append style={align=right}, 
  today=2016-11-22, 
  today label=Heute, 
  today label font=\itshape\color{blue},
  today rule/.style={draw=blue, ultra thick}, 
  /pgfgantt/bar label font = \scriptsize, 
  time slot format/start date=2016-05-30] 
{2016-05-30}{2017-01-01} 
  \ganttset{bar height=0.5} 
  \gantttitlecalendar{year, month=name, week}\\ 
  \ganttbar[bar/.append style={fill=gray!25}]{Abstimmung mit Projektleiter}{2016-09-09}{2016-09-09} 
  \ganttbar[bar/.append style={fill=gray!25}]{}{2016-09-23}{2016-09-23} 
  \ganttbar[bar/.append style={fill=gray!25}]{}{2016-11-04}{2016-11-04} 
  \ganttbar[bar/.append style={fill=gray!25}]{}{2016-11-18}{2016-11-18} 
\end{ganttchart} 
\end{landscape}

\end{document}