I was wondering if anyone out there can help me with this problem, my wife has a 20 foot ski boat that steer's great when you're on plane but if you're just idling around or if you have a lot of people in it, you have to use both hands to steer it, I've tried greasing the steering and tried adjusting the trim tab at the bottom, it has a 150 Johnson on it. Do I need to replace the steering cables or what? It doesn't have hydraulic steering. I appreciate any feedback. Thanks.