Still, I am using max sail area, if I use 100% no roach, then I am at about 17.x-1 IIRC also. BUT, My point, one could use 22or 25-1 for this area no matter how you get it will stand. Be it 100% SA or using all you can get. I was doing 4 something knots the other day in 7 knots of wind. Will see how it goes here in about 45 min or so too.
She drives me boat,
I drives me dinghy!