Pipe tobacco isn't as picky as cigars regarding humidity. Plus it's a matter of personal taste. I like mine dry, but if it gets too dry, I'll spritz a little distilled water in the jar. If I get a goopy aromatic, I'll leave the lid off for a few days.

I have used bovedas for drying out homemade blends, particularly ropes - they're so wet that if I don't get the moisture down to reasonable, they'll go moldy.