One thing to look at is the black weather strip that holds the glass in. I had a guy with the same year and model as yours have this happen at my marina. the trim was old and brittle and water would run down the side glass (right behind the helm on the starboard side) under the glass and come out the other side of the black trim. I wouldnt believe it until I saw it. then it builds up on the fiberglass, runs down to the aft facing seat across moving to the port side, and down around the aft cabin window. I know it sounds crazy but for the longest time he couldnt figure it out so we hing out on his boat having a few beers...I mean bottles waters

, and saw the water coming in. He just put a very thin bead of clear caulk along the window trim to stop it. Much better and cheaper then replacing the window trim. you may be able to see some calcium build up near the trim of the window if water has been getting in this way.