Am 11.02.2014 um 17:32 schrieb Jan Tosovsky <j.tosovsky@email.cz>:

My fundamental question is why ToC has different ToC line gaps than body
text. I still think it is rather a bug which we are trying to work around
all the time…

The chapter entries insert a empty line before their content, you can disable this with

  \setuplist[chapter][before=]

Wolfgang