You might want to have a location in the enclosure that's a bit cooler.
If condensation forms in a temperature location of 75F and not above that temperature you would have a dew point temperature of 75F. At that temperature of 75F the relative humidity would be 100%. If the enclosure has a gradient from 75F to 89F with a dew point temperature of 75F you would have a relative humidity gradient of 100% to 63.47%, 89F being the lower %. This is because the warmer air becomes the more water vapor it can hold. Dew will not form above 75F in this example environment.
A dew point between 65F and 75F would be similar to lower elevations in Indonesia with 85F ish day time weather. The higher elevations have lower dew point temperatures as that the actual temperature is lower. Air can not maintain a dew point temperature higher than the actual air temperature.
Here's a weather link for fun. Wamena is near habitat which would have higher elevation green tree pythons. Merauke is near habitat that would have lower elevation green tree pythons.
Indonesian Weather