Thanks everyone. The response has been great. Crowd sourcing works. I have been given valuable links and will forward to the USCG.
Among them, http://www.wumtia.soton.ac.uk/sites/default/files/CSYS2001BD.pdf
the famous Richard Woods noted
“I saw the video Lock had made by the Wolfson Unit at Southampton University, and the evidence was very clear that catamarans behave as you drew. In our ISO stability work for the RCD we always assume that a boat in waves is stable until the wave height exceed the beam of the boat, irrespective of the number of hulls.”