I guess I've been lucky so far with pdf's. I use the java app on the
pdfscissors/ site to crop the white space, then either just drop them on the Kindle or run them through Calibre to create a mobi file. So far, so good. What sort of problems do you have with pdf's on the Kindle?
I love the idea of installing a different firmware, but this one being Chinese puts me off. I can't even read anything in their forums. Too scary until English is catered to a bit more.