I'm modelling a hardware lug where the outside is purely aesthetic and going for an Art Deco sort of feel. You can see the overall model here (ignore loft 3, I was just experimenting).

However I'm not happy with the ends of the lug which is modelled as a lofted boss. I've used sketch6 (which just follows the edges of half of the end face of boss extrude 3), and sketch13 and a guide curve sketch14 shown below.

The lofted boss results in some strange surface with curves that I don't like. In certain places the loft sort of goes inwards (see below) and I can't figure out how to get a smooth rounded loft.

I'm currently trawling through some literature/tutorials but any help from people with more experience would be greatly appreciated!

Thanks,

Matthew