Dude, I'm in the same position as you-almost the exact same numbers, about 75degrees and 58% humidity. It's probably too late now, but what I do in those circumstances is leave more leaves on and hang as much of the entire plant as I can. Obviously I have to chop some branches off so they aren't touching each other, but I try to leave as much as the plant intact to slow the drying process. I've done this in 80degree/40%rh conditions with great results! In the winter when my drying rooms are usually colder I do the exact opposite-I trim wet and hang individual branches.