If you don't actually have an intake fan, get one, at least a 6". Sm RH of 80% is ridiculously high, unless the room outside of the tent is also 80%.
If you have an inline fan, make sure it's blowing out and your tent walls get sucked in a bit when you close it.
If the room outside is 80%, you'll need a new dehumidifier. Other than that you can defoliate. It will only drop the RH bay couple of points, but it will help protect against mold. Good luck!