I was told that if you have too much or too little zink on your boat that it would scare the fish away. That there is a magical number that can be measured from the boat to the salt water that if obtained your boat would attract fish, mostly trolling as per his story. That is why the boat in front and behind you are hooked up and you are sitting watching. Has anyone heard of this before? I know they talk of this sort of thing with downriggers but zink is new to me. If you have, what is the number? And would it apply to a fiberglass boat?