That is an awfully narrow range sail ... sounds like a race sail for long distance where the wind is predicted to be just right for it. Hey 155 is where we love to sail the S.
It still won't get the boat up on plane in 20 and you will be lucky to run at ~8 kts in comfort. And you will need crew weight in the back of the boat.
I think we are all better off with a standard AP spin on a pole. You have a lot more options on course changes and spin control. And for sure one 15 year old can do foredeck in non race conditions easily. We have 70+ year olds that play foredeck spin all winter here. Our standard Program A day sail is upwind 3+ miles, and get in position to return with wind 110 to 160 or 200 to 250. Nice safe fun spinning.
