Marine Electronics Questions? Ask a Technician for Answers ASAP
If the cone is turning ok out of the water then this problem is likely occurring because of the way the water is swirling out of the cone - there are some straightening "vanes" that attempt to counter some of this swirl action, so maybe those stator vanes are missing or damaged. When they get damaged they can affect steering. Examine around the cone area for any signs of damage.