Are you leaving your rods in a rod locker in your boat? If so that will break down line. We always put new line on for tournaments but we won't leave them in the lockers, it gets really warm, ok hot in there and we have found we don't break off if we just leave them on the deck instead of the locker. Others that fish our club have found the same thing.

My take on line, we use yo-zuri and cajun red, love the way the red comes of the reel. We don't use any braided line at all.