When you use save as pdf as an option from the menu is there a tooltype or even HEX edit to set the size?

Thanks

yes, as an overview I'm looking at increasing the default resolution

Print as postscript to file then convert to a PDF using ghostscript.

Then you can use the -prepress options or the -rXXXxYYY resolution option or what ever you need.

As well design websites use graphics designed for screen resolution result are going to vary somewhat.