It is very important to research what the native plants are in the AGTF environment so it is easier to replicate. First off, you should avoid housing anything (and i mean, everything) together that does not have the same care requirements. Like you've noticed, you are already compromising on what to care for more.
Try lowering the humidity by increasing some vent holes. Plants by themselves release moisture thru transpiration and thus increases your humidity levels more. Your substrate is nice as they drain easily and hold moisture easily but you have charcoal in it, a moisture absorber.
Air temps are significantly lower below and around the plants and warmer away and at the top of the plants (because of transpiration). What specific kind of plants do you have anyways?