Indeed, as a contributor to that earlier thread, I can only repeat that lofting ship hulls (and I guess many other things) works better when you use only the absolute minimum number of curves necessary to describe the surface. And it helps if the curves are 'clean' (i.e; rebuilt with even-spaced control points etc.). Also, do not attempt too much. There are features on ship hills like sonars, bulbous bows, propeller shaft housings etc. that are best added as separate pieces and blended into the simple hull.

Difficult areas in ship hulls are at the bow and stern of the ship. In such cases, blends work better and provide more suitable surfaces. But in every case, what looks like a rather simple shape turns into a rather complex thing to model. NURBS work best for non-organic shapes, but unfortunately, ship hulls are rather semi-organic shapes.