Rich,
I've got the same paper for a very similar project (Serpents tomb from Sally 4th).
I made this mock up for a colour,and texture test,and to see if it'd be comfortable on larger areas(it'll all be recycled). To the point does your paper have a similar issue with the image mesh when the pattern is repeated on the full sheet?
It's not an issue when the sheets are cut down to fit the 5cm walls. I was just wondering whether I'd a dud batch. Or if its a general flaw.
Mark.