Making a smooth sweep 1

Hey everybody,
I made a shape out of modifiable profiles along a sweep (S1


but i cant make the shape to grow smoothly, as you can see in the img (S2), the side that is changing its height is getting a strange divided line instead of one continues clean curve.

any help will be very appriciated (58.6 KB)
shape.3dm (139.0 KB)

Create new curve and use sweep 2 rails (58.7 KB)

i wasn’t familiar with the sort curve along curve component, so thanks for that also