Blend Curve with Same Profile


Is there a way to blend curves with the same plan?
When I blend the two sets of curves, although the original curves have the same plan, the blended ones do not.
How should I achieve the target without manually manipulating the control points afterwards.

Thanks a lot!

draw the first set of curves.

then use _shear for the second set.

post a file if you need more info - kind regards -tom