Here is the best thing about powdery mildew and mold. POWDERY MILDEW = LOW TEMPS AND HIGH HUMIDIDY. It’s like a math problem. If you take away one of those factors you will NOT have mildew or mold. Do NOT let your night time temps get below 75 degrees and you will never have powdery mildew or mold. If you can’t get your humidity down, this is your only option. Great job man!