Hey this is my first time posting but anyways I just bought a 1973 Browning boat that is fiberglass with a 65 hp Johnson outboard and I just put it in the water for the first time and it started taking on a lot of water when I was moving at about half throttle it's looked like it wasnt taking in much water when I was sitting or a1/4 of the throttle but I can't find a leak anywhere I just bought a new drain plug before I took it on the water please help and it's also a trihull and boats all fiberglass