Ahh, 12,5 ex mast; there is the reason for my misinterpretation of that area. As I understand it the A=cat class also includes the area of the boom in the 13,94 sq.mtr. limit.
The area limit for F16 mainsail is now at 103,5 % of the 8,7 mtr. by 13,7 sq.mtr. (=13,94-area boom) of the Javelin 16. Ergo the current proposed Jav 16 mainsail is at 97 % of the max allowed.
So yes the jav 16 mainsail is a pretty good F16 mainsail and the jav 16 will be full compliant in this setup in both 1-up and 2-up races.
Wouter