To stiffen the all-carbon mast I have added epoxy to the top half of the extrusion. It is stiff enough to make it difficult to bend to match the sail. Foam from Fibreglass Coatings or other quality place would not have the effect of giving me a long-lasting permenant curve. I tried that some years ago on a Suicide mast to give it permenant bend. There is not really much volume inside the top half of a board's mast. So I've put diamonds on it. Cut out a little bit of sail at the mast. Yes, I was careful of 'point loading' at the diamond spreader mast end and at the wishbone terminus. I'll be putting significantly more strain on this mast than it was designed for.
This Formula 14 is an idea test-bed for me. Some things will work. Others will bomb. I don't mind re-trying what others say won't work 'cause so-and-so tried it and it was slow.'
I have taken a monohull from a Portsmouth of 92 to an honest 79 without increasing sail area. Just keep honing, tweaking, experimenting, testing. spending money.
Hey, keep the ideas coming. I am a writer. But I can plagiarize boat ideas!