Uploading the part file would be a good start. Btw I could not get to the previous thread.
I'd wager you're trying to loft too much at once. There are many discrete contours that probably should be separate lofts.
The Boundary surface would be a better choice than Loft, because mathematically it can handle a greater number efficiently and more accurately of 1st and 2nd direction curves than can Loft. Lofting for marine design is kinda "old-school" and more modern techniques of creating boundary patches with 1st and 2nd direction curves will produce better results. This is especially true because of the "Keel-lines" that it looks like your design has; you want to model these as explicit boundaries (i.e. model to them.) SDS (sub-divisional modeling) produces excellent results on shapes like these especially where the style edges of the water lines fade. you can go to npowersoftware and download a demo version of PowerSurfacing to try this out if you prefer.