Color temperature may not be the only determiner in this instance. The Aristo lamp, depending on the phosphors which were used in the manufacture of the lamp, may have emissions in several distinct nm bands. These would then have the effect of arriving at an "average" which would give a certain measurable color temp. This "averaged" color temp could conceivably have a sizeable portion of it's emission band in a region that is causing you high contrast problems. This is the nature of grid light and "flourescent" types of lamps. Aristo came up with a lamp designed for VC papers for some very good reason.
If I were going to try to work with this lamp, the first filter pack that I would add as a trial would be what others seem to use and that is 40 units of yellow. If that were not enough by itself, then I would "kick it up a notch" by another 20 units of yellow. If that were ineffective in bringing contrast down then I would begin working in the blue and green filtration.
In my VC enlarger the filtration that is varied is magenta and cyan. The two colors that are varied in exposure of VC emulsions are blue and green. The reason for the two colors used in the Saunders system is the difference between "additive" and "subtractive" filtration that is used in printing. Saunders happens to use a "subtractive" system and others use an "additive" system of filtration.
In the case of my Saunders VC enlarger, the light source is a low voltage halogen...and not tungsten. Tungsten is a very yellow light source and halogen much more blue (higher color temp.)
I hope that this proves helpful. Good luck.