we have a 27' Catalina, in the chesapeake bay. After a great day of sailing we were motering up the river against a wicked tide. Im not sure what was going on, there was no water anywhere in the boat, but the stern was sitting real low in the water 6"-8" unter the water line with the exhaust pipe fully under water. it almost felt like we were dragging something. this never happened before and after pulling in at the marina out of the current we began to float normal again. anyone ever have a problem like this?