Thank you for calling my attention to numerous other considerations that, as of yet, I hadn't thought about. But I wasn't clear in my original question. Assume I'm already in deep enough water to use the drive. I'm heading back in in a 3', choppy, slow surf. Few faces to ride. But it could be steep enough to warrant slipping left or right to avoid pearling. Should I use the drive system for propulsion, use it as a skeg (or more accurately a centerboard) or should I fold them up against the hull and simply steer? I know I have to fold them up when it gets shallow. But I plan to bail out before it grounds to protect the system.
Would using them as a vertical stabilizer be advantageous further out surfing in on the swells? Or should I fold them up?