I've been using a Lass Paddle for a few months now. It's a boutique paddle company created by Helgo Lass, who has been in the windsurfing industry for decades creating carbon masts and that developed paddles for a few SUP companies. He uses V Drives and Double concaves. You can check the technology in this page:
http://www.lasspaddle.com/#!technology/c20sg They are starting to win races all over the world (including in my country, Portugal, where José Cirilo absolutly dominated with this paddles).