Reheat without making sure that all of the a/c cooling coils are as cold as possible is spinning your wheels. Cooling coils operating at <40-45^F are the starting point. The dew point of the air inside the store will be 5^F-10^F above the a/c coil temp provided infiltration is under control. Reheat only work with extremely cold coil a/c. For situations where there not free reheat, use high capacity, high efficiency dehumidifiers like the Quest, Ultra-Aire, Hi-E Dry. These unit remove 6-8 lbs. of moisture per KW and provide free reheat.
Most important first to get the a/c operating with the coldest coil possible. Slow the air flow is a way to get the coil temp needed.
Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
Use +Merv 10 air filter. -Don't forget the "Golden Rule"