To elaborate a bit further, the dark orange mask distorts the response of the VC paper. You may dial in the contrast settings for grade 3 but you will not get a grade 3 response from the paper. Remember that VC papers use only the blue and green regions of the spectrum. The ratio of these colors determines the contrast of the paper. Orange filters out most of this region of the spectrum, but not equally for both colors. There's the rub.
There are two options. You can get some graded paper and put up with long exposures or you can get the negatives commercially printed on color paper. Actually there is a third option give or trade the film to someone else. Sometimes a good deal is not a good deal.