In the technique for scanning color film, they're really making their life hard for absolutely nothing!
Here's what I do:
1. inverse the image
2. open the levels, take the white eyedropper and select a region that should be white.
That's it!
The color cast will be perfectly removed in the blink of an eye. If you don't like the result, you can undo and try with a different region. If you get the film edge, it makes things even easier.
What I found is that my camera needs to underexpose the negatives just slightly so that they come out brighter when reversed.