With high humidity, I'd keep the A/C fan on high instead of auto for more air flow. You might remove the filter door off the inside ceiling cover and snug the 4 bolts that clamp the A/C to the roof. You want the gasket to compress evenly about 50%. As to the water running off the roof ... if you're slightly off level, the water will usually drain off the lower side. You can always remove the half a dozen screws and pop off the outer shroud to see if something is in the drain holes in the metal pan the compressor is bolted to.
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