4 by 8 tent problems

I have a 4 by 8 tent, i have the inkbird temp and humidity controllers and 4 mars hydro leds . Right now i used a 6 inch fan to pull air out to decrease temp and i got a humidifier to boost the humdity when needed. I find the fan to keep things cool is running often and also when i water humidity can jump to 60% when lights are off because ehaust fan wouldnt be running. Im wondering if i should get another 4 inch fan and use that just to pull out excess humidity when it goes over what i want it at and im not sure what to do more for heat.

What is your temps like outside the tent during lights off? If it isnt too cold outside the tent when lights out, you can continue to run the exhaust to keep humidity lower after lights out. When the temp cools in your tent after the lights go out, rh% goes up.

Outside tent when lights are on is around 20 C but when lights are off its between 18 and 19