Uni beachcats require good timing and technique to tack in big winds with heavy surf. Speed, initiating the turn as you approach the crest of a wave, and dropping the main sheet the moment the main starts to point to weather. We also move towards the rear beam to lift the bows and help rotate the hulls around but move quickly forward once around to help the boat accelerate and not stall and weather vane.
Forget a smooth turn, you want to make it as quickly as possible without killing your speed. If you get caught and start moving backwards, you can reverse the rudders but be careful and be ready to release the main some once she comes around so that you can bare off, get under way, and then start to head up.