M-dynamics, joking)), I can make it really great with loft too)))
By the way I stumble on your videos on vimeo, I saw you made fender of the car, so I thought may be all problems would be solved if you extrude fender curve not in the X direction but use extrude - set dir or better LOFT)))) to change angle of extrusion to make blend do not make that angles that you fixed.. Or just extrude it in Z. Don know how it will work in this case but just an idea.