As a fairly new owner of an ''83 Catalina 30 I am baffled by the prop walk. My boat goes backs up like a drunken sailor (to port). I have a 3 blade fixed prop. Once a get some sternway going I can control it fine. Getting the boat to back straight from a dead stop or a slighly forward motion is about impossible and trying to set my anchor is a real challange. Any help????