I ignore all the alleged grade values and complicated nonsense associated with it. With my enlargers
plain white light prints most VC papers at a decent mid-range, about like Grade 3. If you want more
contrast, dial in some M, if you want less, use Y. Some papers will not obtain a good DMax unless
you expose both emulsion layers a little. Then you can learn how to split-print using different filter
values selectively. I just run simple test strips, and tweak the colorhead if necessary by simple
visual evaluation after I dry down the strip.