With my old 9880 I could not find a feed adjustment that worked with all media. Since I usually resized for printing, just before printing I would resize the long axis by an amount I knew would work for a particular media.
In the "Image Size" dialogue, if you click "Resize" you can then disable the chain symbol that keeps height and width proportionate to each other.
For instance:
1.5 * 1.5 / 1.485 = 1.5152 for the resized Width, but leave Height the same. That should print to exactly 1.5 meters, with that particular media.