70 is too low for the cool side, the minimum temperature anywhere in a BP enclosure should be 75F. You may want to add a (thermostat controlled) heater to the room or try a method of adding a CHE to the tub.
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Also are you measuring the humidity with a digital hygrometer or one of these?
Analog hygrometers (as shown above) can be very inaccurate. My BP stresses out and tries to escape if the humidity is over 85% (this happens if fresh cypress mulch is added without drying it a bit first) when he’s not shedding so humidity issues are also a possibility.