US56 is slightly more attenuative than S04, but S04 should be okay as well. Look at your extract choice to get dryer beer.
For better extract attenuation, try to choose Alexander's or Cooper's malt as they are the most fermentable. Stay away from Laaglander, the least fermentable. Munton's is middle-of-the-road for fermentability. If you change to dryer extracts and still get under attenuation for your liking, substitute a single pound of sugar (corn or cane) for one pound of DME. That small amount of sugar won't cause any 'cidery' type problems, it will just dry out the brew.
Be wary of strong drink. It can make you shoot at tax collectors -- and miss.
--Robert A. Heinlein: The Notebooks of Lazarus Long
Brewing Water Page
- Enter and view water data.