For two up sailing, you should have 3mm or better 4mm shrouds and the part of the forestay, which is above the jib luff should be 4mm minimum, the lower part might be 3mm. The shakels 6mm at least. That`s what you find of most double handers. With hulls and mast designed for two, it shouldn´t be a problem.

The main is hard enough, if the leech stands up straight, even with the downhaul on. That`s universal for all sailboats.

Cheers,

Klaus