Instead of doing one and then the other, why dont you run bot exposures on the same paper. I used to do hard diagonal from bottom left to top right and then soft from top left to bottom right, this way I would get a set of squares and usually one had the right exposure of the combined filters. It is also easier to see the areas where you will need to dodge or burn.

I only use VC for very hard negatives to print, usually I go with graded papers.