Well, I can't complain about the plant sizes. They are actually quite healthy. N burbidgeae is the only one that looks a little sick. It almost had no roots

Hopefully all the plants acclimatize to my conditions ASAP.
One way to provide extra humidity is to use a big pot, at least twice the diameter of the plant. That way, the relative humidity around the plant remains high as the wet media will slowly evaporate around the plant.