No Boom Vang?
I had a boat of similar size that did not have a vang, but once I added one, I could snug it down when the breeze piped up. The flatter mainsail sure made a difference when I had upwind work to do, and I immediately praised myself for my wisdom. It would be such a simple install for the performance results esp. on such a small boat, I can''t think of any reason for not doing it.