1. I don't worry about the scratches... they are like battle scars, wear them with pride. If they really bug you, I would recommend a soldering iron more than a heat gun. It will keep the heat localized and so reduce the chance of deforming the hull.
2. Tracking is an issue with my outback also. I have just learned to live with it, and I do the constant corrections without really thinking about it. Kind of like an old truck with sloppy steering.
3. The only time I get any water in the hull is when I surf launch. I always take a few waves over the bow, and I think the water leaks in through the front hatch.
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