I solved my PDF whitespace problem using ghostscript and psutils. Ghostscript provides pdf2ps, and ps2pdf tools. psutil includes psnup which will paste p N pages per page. The power tool in the psutils family is pstops which will do a number of page layout transformations. If you then tinker you can find a combination of scaling, offset, which eliminates all the whitespace for the document in question. So, I have the technology, even if I don’t have an easy to use solutions … yet.