I've sailed my Getaway on Lake Michigan in some 20+ winds with 3'+ waves. No problem. A wet and wild ride. I've soloed it on Lake Mendota and Koshkonong, both 10000 acre lakes, in 25+ winds. That was right on the edge for me. If I'd had crew, it would have been wild fun.
I did have reef points put in my sail by Quantum Sails, and I'll reef it if the winds are gusting much above 20.
The conditions you describe don't challenge the boat at all. It sounds like a pleasant day on the water, moving the boat nicely with no great excitement!

The Getaway can handle higher winds with less drama than H16s. Heavier hulls, slightly shorter mast, no boom so the sail spills air. I often sail with a couple of H16s in big wind, and when they are flying hulls and sheeting out, I'm barely lifting the windward hull. With 20+ winds, the Getaway and H16s run at a dead heat. In significantly lighter winds, the H16s are faster than the G.