Hope you folks can tell us where we've gone wrong. We printed and finished 1,000 - 12 page booklets, 8.5" x 11" with 2 staples on our digital press. The client wants them folded down to 5.5" x 8.5". We've done this before but now we can't get them to fold without a bunch of wrinkles in the original fold. I really don't want to do these by hand, any suggestions ?