they're slightly oversailed
Sail plans used to be a full set when in trade winds, or 18-20 knots. Below that you added a geoa and above that you begain reducing sail. But with a SA/D of 142 the C-22 should be reefed before 18 knots of wind unless you have a good crew and/or racing. I have sailed to the rail with a 3 man crew in a race in 25 knots, spilling air on the puffs, and nearly broaching twice, in 25 knots--we left out the 110 and full main on the windward leg to use it on the beam reach leg and downwind, so we would not have to spend time reefing. Can't say if we gained anything, we luffed alot. It was hard on the canvas and rigging too. Depending on point of sail, 15-16 knots (measured on a Kestrel anemometer, not guessed at) and the boat is heeled hard enough to not gain any speed. A reef in the main at 15 knots is not a bad idea, have been in 30 knots with 32 ft2 jib and one reef and it was under control. Ocean sailing makes it easier to know when to reef: using the Beaufort scale, when you are beginning to see regular whitecaps, reef. All whitecaps is too late. But on a lake, esp. mountain lakes, squally winds can hit you very fast and the waves catch up after the fact. C-22's are quite forgiving but seem to like to sail flat