Skin Curves

I have two curves - one at deck level (with camber) and one at bottom level (angled flat surface).

Both curves have been projected from the same source curve on to surfaces at deck and bottom level (deck is hidden in image shown).

I need to generate a curve that wraps smoothly around the fwd outboard corner and believe I need to use the 'skin curves' command.

The command / process worked first time for the aft corner (same deck surface and similar bottom surface) but fails to work with the fwd corner.

I've tried numerous settings in the 'skin curves' dialogue but the surface generated is wrong - see second image.

Are there any obvious pointers someone can provide? I've tried the manual and Bentley YouTube videos without success.

Many thanks, James