Printing multiple sheets per page - Kubuntu 14.04, Chrome and Okular

When I print multiple sheets per page from a PDF, they take up an absolutely tiny amount of space, so much so that I'm pretty sure 16 slides could fit on a single side.

What I'd like to do is to have it take into account physical page edges, and just put the selected four slides on the page as large as possible, in landscape, left-to-right, top-to-bottom as seen from landscape.

I'm using Brother's own LPR and cupswrapper setup on this HL-2030.

Is this a common CUPS issue? A Brother issue? Chrome and Okular behave slightly differently (they seem to interpret landscape differently - Chrome orders the slides as visible from the correct orientation, whereas Okular jams the slides on the portrait page in the selected orientation).

How do I fix it? I'm kind of getting tired of looking at tiny text.

Any experiences by fellow Brother users are welcome too, be it the same or different printer models.