Net setup - all good but high humidity

[Homebody]

Hot side stays around 90-91 at surface

• Ambient temp is 70 degrees
• Humidity stays between 85-89%

Your ambient is too low. Most guides I've read, including the care guide on this forum, say 80F. I've read some that say 75F. Nobody says 70F. Hopefully, when you raise the ambient, it'll lower the humidity.