I sailed my FX One in 18+ a few times this summer. On a 26 mile distance race, 13 mile down wind. Started the run down wind at about 15 kt of wind and peaked to 20 kt.

Quite the ride the boat just flew, never had a problem with hangling. I didn't push it too hard though, crossed alot of shiping channel.

Long runs like that help in getting used to a boat. Just time on the water.