[NTG-context] Centering the page

%%% Document %%% % engine=luatex \enableregime [utf-8] \mainlanguage[uk] \language[uk] \setuppapersize [A4] [A4] \showframe %\showlayout %\setuplayout[width=middle] \setupwhitespace [medium] \starttext \input knuth \input zapf \input tufte \stoptext Look at http://filebin.ca/rzjruz/test.pdf or http://filebin.ca/rzjruz, you'll notice a reasonably sized gap on the right hand side, how do I get rid of it? The work around seems to be \setuplayout[width=middle] But this isn't want I want as the width of the text betters slightly bigger, see; http://filebin.ca/ttufjc/test.pdf or http://filebin.ca/ttufjc . Thanks