@Saintgrower, well if you have access or the means to buy yourself a small dehumidifier that would be ideal to get it down to around at least 55. If you can get lower then that then even better. I have 2 small ones from Amazon that do work great and keep my 5x5 down to about 47-52 depending on the day outside and if I watered or not. Doesn't have to be an expensive unit. If there is a window you could open or a dial on your exhaust fan to turn up the speed of the fan that would definitely help to. If you continue with such high RH you will run into rot and mold problems. Nobody wants that. Also maybe look into grabbing a second hygrometer just to be sure your readings are correct or within range of one another.
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