I'm also using Southcoasts on all my ukes these days. Low G, High G, Tenor, Concert & Soprano. They sound great on all! Love the tension level, no squeaky picking fingers, and they stretch and stay in tune quickly! Great for string changes a day before a show. I used to let strings (worth and daddario) settle in for a month before playing live! These make it easier to get a fresh set on my main players. I don't own a Pono, but thought I'd throw my experience in to the mix.
Good luck and Congratulations!