If you are struggling with your crop perhaps improving the humidity or evaporative cooling could improve your productivity. Zwart Systems Ultra Cool is a great way to control these environment issues.
A high pressure compressor on a VFD atomizes the water in droplets so small they evaporate quickly without leaving your crop damp. Stainless steel lines positioned in the greenhouse will distribute water to nozzles at 1000 PSI and send it out as a fog. Depending on conditions, Ultra Cool could drop your temperatures by as much as 5- 6 Celsius and could raise you humidity to the desired levels.
Typically this system works best when RO water is available or town water is possible. It is not recommended for use if the main water supply is from a well or pond.
If your water source is questionable perhaps the Aircool fan is a better option for you.