Thats a nice looking crop. Why not just get a dehumidifier to bring it down in a better range. If mine was at 71 % I would have mold issues more than likely.
I have a small dehumidifier dough have the dough for a big one not the power supply to use up another 8 amps. My limit is 30 amps and I'm currently using 26 amps.
I'm going to leave the lights fan on during the day too see if I can just push the excess humidity out (while the lights are on it the air exchange drops the humidity to 46-55 range).
Also I have incredible amount of ventilation and I prune overly dense foliage and leaves that rest on buds.
I'm only 3 weeks into flower.