What you did was bad and you should feel bad about it. Subjecting a poor 5" screen to large pdfs with tables *shakes head*. Not even on my 505.
On your conversion thingie... I'm not an expert but have you tried converting to... epub or rtf? And perhaps you should post in the Calibre forum or somewhere else but related to "format conversion" not large pdf viewing cause everyone thinks about large ebook readers when they see that.