Dish out the money for the dehumidifier man. That RH is way too high flowering and you risking mold or bud rot. Getting the dehumidifier would be cheaper than upgrading your ventilation system. This is the cheapest one that I could find: http://www.target.com/Amcor-Mini-Deh...idifier&page=1

If you look a little harder you might be able to find a better one

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