Before jumping to conclusions, maybe make a proper contact sheet (i.e. reaching max black through the film rebate, 2 1/2) and see what they look like. They might be bang on & with sufficient contrast where they need to be -- but different from your preconceptions. You'll be able to tell if they are printable or if they are underexposed or underdeveloped from this standard way of making contacts.
I don't know how you meter, but with a key, fill, and backdrop light, I use a flash meter, and measure each lamp in turn, setting the ratio I'm after, and not the whole mess together.