What I use when I get a new negative is a shot of someone holding a gray card exposed by flash, or truly 5500K light (checked with a meter). Then balancing goes very quickly using a set of viewing filters. The worst way to do it is with any sort of shot taken under unknown lighting.

Each film will have different base filtration. Keep a chart of film and paper combos. Also, standardizing on just one, or at most a few films, will make your like much easier.

Post what films you are using and maybe someone with the same enlarger can post their starting values for that paper.