Too little humidity can cause the stomata to close and make your plant have canoe leaves or otherwise stress it. I think 40-50% is good for flowering if you can raise it a little. I had a lot of low humidity during veg in my setup but it was 35-40% or so. Try putting in a bowl of water. Also if you can lower them temperature in the room the humidity may rise. As a last resort fill a spray bottle with water and spritz it all around the room to dissipate into the air.