I'm using a rack system with tubs, and humidity in each tub ranges from 80-90%. There is some light condensation on the cool side of each tub, but both the substrate and the surface below the substrate are dry.

Should I be concerned?

I have melted holes into the front of the tubs for increased air flow, but that only knocked the humidity down a few percentage points to bring it to the current levels described above. I have also brought the water dishes away from the basking end.

For substrate I am using turf.