I have a problem which may be related. I read a lot of academic journal articles which you download from the publisher's websites as pdf's. When I transfer them via usb to Kindle the type comes up so small I can barely read it. The font resizing button on my kindle produces (for pdf's) a menu which doesn't help enough. I have tried turning the screen sideways and enlarging to 300% but it's still too small. The 'zoom in on images' tool that comes in that menu only enlarges part of a line, so it would be hopelessly slow to read with.
Is there some way to make pdfs more readable on my Kindle ?