Select two curves and a rail and it just doesn't work right. I've rebuilt the curves (not the rail, should I?) without success. And FWIW, I could not get the variable radius to work on this edge either. Thanks for any help!

FILE: HERE

1. Second part of sweep isn't tangent to surface, but both originating arc curves are tangent.
2. Sweep settings.
3. Another view of the incorrect sweep.