You may want to try this simple test. Tape a 12" square of that .013 plastic tightly to the floor ( as air tight as possible). Let it sit for 24 hours. If moisture shows under the plastic, it's probably coming from the slab. If moisture shows on the top surface, it's in the air. Another issue that comes to mind is a problem that showed up in a condo in Naples, where the AC unit was slightly oversized for the unit. The system cooled the space so quickly, and shut the AC off, that it did not have enough time to dry the air. Just another thought.
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........American by birth....Union by choice
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