cilantroanswered grow question 5 years ago where are you pulling air from and where is it going? What is the air temp and humidity outside the temp like?
You need to decrease temps and increase humidity, no way around that.
Start by moving your extraction to the top of the tent, right now you're removing the coolest air from your tent and pulling hot air from your light down into your plants, you want to do exactly the opposite.
You also need to do anything you can to increase the humidity, it can be as simple as hanging damp towels in the tent which works just like a swamp cooler.
Back the light off and turn the power down if possible, it's far more productive to use less light and have healthier plants than to blast leaves that are barely functioning in light.
At the end of the day once the outside air reaches a certain point your only option is air con.