VERY high latent load autosizing

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I'm modeling an indoor greenhouse. The watering of plants creates very high internal latent load. Concurrent with that, the plant evapotranspiration causes a sensible cooling effect. Overall, it's a very unusual sizing problem - at least I think it is for E+ autosizing.

Regardless, E+ is NOT controlling humidity very well for the chilled water system I've defined :(

Can you provide any tips for proper setup for autosizing in this situation?