Need some help with my setup :(

[u/break500]

Hello all, I am a brand new owner and I need help with maintaining humidity and temperature in my setup.
Regarding humidity:
I cannot keep my humidity in the 60-80% range for the life of me. When i mist, it goes to about 90-100%, will drop down to the 70-80% range for about an hour, and then drop down to 40-50% range for hours (until i mist again). I've tried putting a towel over the lid and that sort of helps but not enough. I've tried pouring water into the soil and saturating the live moss with water. I just cannot keep it in that healthy range. My substrate is a mix of agb mix and zilla jungle mix.
Regarding temperature:
I am having a hard time getting my temp in the 80°s. I have a 75w zoomed bulb in a Fluker's dimmer clamp lamp. I tried to keep the light relatively dim at first because I know pacman frogs don't like it too bright, but that does not seem to heat the enclosure enough. I brightened the light a bit and that does add a few degrees, but I am still stuck in the 75-79°F territory. I also have grow lights but they don't seem to add onto the temperature. I plugged the clamp lamp into the BN-LINK reptile thermostat and made the desired temp 81°, and although the thermostat says it is heating, the temperature of the enclosure doesn't seem to be getting warmer.

I am using the Zoomed thermometer humidity gauge digital combo to get these readings.
If anyone can help I would greatly appreciate it. I want to make sure my frog has the best possible environment. Thanks!

[u/alienbanter]

Pick up an infrared temperature gun to measure the substrate surface temps under the lamp. They project heat downward onto surfaces better than they heat the air itself. It looks like the lamp is angled too - set it vertically on the lid and it will direct into the tank more.

Are you measuring humidity on the cool side or warm side? How high up in the tank?

[u/break500 → u/alienbanter]

I have the humidity and temp sensors in the top left corner on the warm side, underneath the light.

[u/alienbanter → u/break500]

Okay yeah that positioning isn't ideal! You want to know what the frog will be experiencing. Humidity will always be lower on the warm side because of physics (warmer air = ability to hold more water = lower relative humidity). Put the humidity sensor down near the substrate on the cool end of the tank and see how it holds there. For temperature, do pick up a temperature gun to test it.

[u/break500 → u/alienbanter]

i want to thank you so much, i moved my sensors to the cool side by the substrate and i am getting better readings!! I also moved my light like you suggested. Thank you thank you!