[texhax] can't control page size - why? (the real problem)

[Karl Berry]

    Switching to dvips did change the BoundingBox, but I still have no
    control over it!

What options are you giving to dvips?

Maybe try:
  dvips -T16cm,16cm -tunknown yourfile.dvi -o

By sheer coincidence (?), another fellow posted to Debian and thence to
tex-k with the problem that dvips was "rounding" paper sizes to the
closest "standard" size.  Perhaps that is happening here.  Just a wild
guess ...

Best,
karl