Don't know about Stealths being lighter aloft, BUT, I can (at just 65Kg) right the boat on my own in the lightest of breezes - I did a series of deliberate capsizes with the club rescue boat standing by just in case

BUT to do it I had to stand right on the tip of the lower board, and I WAS starting to get very worried as it started to bend! It held however and up she came.

Since then I've been over once in a blow on my own (probably around 18-20 mph) and again she came up real easy without having to resort to bouncing on the board.

Perhaps it's technique?