Thanks for your post. One small correction, the SA/D of 16.09 is based on the information we found on the rig measurements for the Ballad so it’s based on 100% fore triangle.
Some good news… We are VERY close to launching a new, upgraded site. Included will be a calculator where a user will be able to input changes in sail area (or displacement, ballast, etc.) to see how the changes effect the performance ratios.