QTR-Quadtone RIP

As a follow up, I've been banging my head on this and still not got
there -- my latest idea was to create a custom size paper.

ISSUE 1 - if I used mm as the size unit I couldn't get a width greater
than 330 !!

ISSUE 2 - switching to inches and setting a paper size of 11.69 x
16.54 I got something on screen which looked like an A3 sheet, but in
the end still only get a print that is 23cm wide rather than the 27cm
I'd wanted.

Does ANYONE have a solution?  I've been getting this with both 2.5.2.0
and 2.5.2.1.

It's doubly frustrating as I'm trying to produce exhibition prints at
the moment, and QTR is the only tool I have that produces such
beautiful, neutral B&W.

Thanks

Chris