> Is this what you meant?

Yup, that's what I meant - this way you are guaranteed to eliminate any creasing.

But yes a side effect of this method is you have to place more profiles to control the shape along the central line.

This one does look like a good candidate for Network surface, so hopefully that should help out here when it is ready.

One other thing you can try is to use the rails to generate the smooth tip instead of swinging profiles downward for the tips. By this I mean having 2 rails like so:



Those rails collapse down to a point but this can be more well behaved in certain ways because all your profiles can stay completely upright and there isn't a big rotational swing when moving between any 2 profiles. That's just another possible configuration...

Maybe it is possible for me to beef up the sweeper a little bit to avoid the twisting/rotational problems that happen with the half-sweep in cases like this... Might be a bit difficult to do right now though.

- Michael