Are you using a digital hygrometer to monitor your humidity? Those analog ones are crap, and don't show accurate readings.
Have you calibrated your hygrometer to make sure it's accurate?
What are you using for humidification?
I like to keep my stuff at 65-68 RH. I don't have a humidor that cools, so I'm at the mercy of whatever my house temp is (in the summer about 76, in the winter about 70). I haven't had any problems with my system.
Just keep an eye on your sticks, occasionally I do find a spot or 2 of mold on a random cigar. In those very rare instances I just wipe the mold off and wither put it back or make that the cigar I'm going to smoke at the time.