Sounds as though the carbon mast option may be marginal for double-handed sailing

Where'd you get that one from flatlander?
EVERY Stealth has a carbon mast and it's VERY FAR from 'marginal' two-up. My carbon mast demonstrates much less bend than I've seen on our local Spitfires, Nacra F18s and Hurricanes (all with ali masts).
Also, although it's considered to be the 'older' pear shape it does make the mast more forgiving in a blow when flying the kite - it's not quite so critical to rotate the mast to 90 degrees downwind.