Below are my two plants.

N.mixa. Please help correct the name if the identification is incorrect.
The next plant is N.albomarginata.
My plants aren't that nice looking yet. Maybe because of the humidity. Day time can be as low as 55%RH and night can be as high as 85%RH. Any advice on how to increase the humidity?
In the past my mixa refuses to form pitcher when located at open space with 50% shade cloth.