Almost all my time aboard C-Buoy is solo. My ample presence starboard cause the boat to list so I've taken to one cheek on each seat piloting. Since that is both uncomfortable and unsafe I need another solution. The setup is an installed 13 gallon fuel tank center/port at the stern and 2 batteries starboard also in the stern. After searching this site for advice, I settled on a water storage ballast bag that will fit under the mate's seat and will provide 155 lbs to counterbalance the corpulent captain. Just ordered it and will let you know how it does.
http://www.wakemakers.com/fly-high-fat-brick.html
http://www.wakemakers.com/fly-high-fat-brick.html