60-70% RH is preferable.
The lower the humidity and higher temps can cause hermies.. and even higher RH and higher temps can cause hermies.
25-26 deg Celcius with 60-70% RH is preferable.
...but that is me.. and a few others.. and many references.. your call.
Here is a point on resin production: the lower the humidity, within reason, during the flowering phase will enduce the plant to create more resin to cover the plant to keep the moisture in. Plant 'breathe' through their leaves, and during any respiration (whether it is plant or animal) moisture will be given off along with gaseous bi-products. For animals it is CO2, for plants it is O2.