I just took my 81 Mac 22 for her first sail today. She seemed to be a little loose with more side slip than I would expect. I believe I had the center board down all the way but I honestly wasn’t sure. As I came in there was a guy directly behind me with a Mac 25 . He asked me if I had filled my water ballast. News to me. I wasn’t aware Mac 22’s had such a thing. He explained that there was a valve just aft of the aft berth where he turns a valve. Any help would be appreciated