SOS please help...resulting fin not to normal

Hi all,

I have a bunch of curves on a surface, and i have finned ( fin results are not to normal )them by using these steps,

-intersecting curve with surface to get the normal
-dividing the curves on the surface with a certain division
-moving these divided points along the their normal respectively(normal retrieved from curve and surface intersect tool)
- interpolating the divided points which are moved
-lofting the new interpolated curve with the original curve

i tried an alternate way, which is by
-dividing the curve on the surface into a certain interval
-using closest point to surface to get the uv's and then connecting it to evaluate surface to get the normals
-and then moving these divided points up
-interpolate curves on these moved points
-and then lofting the original and the moved interpolated curved

but it is the same result, that the fin is not to its normal.
can someone guide me? is there something that im missing?

Thank you so much!

Guan