Summing up a bit, then expanding the discussion, what you have there is a plant whose root system is incapable or supplying sufficient water to the plant.
The plant would likely do better if kept a maximum RH, to slow the ongoing desiccation, so I'd invert a plastic bag over it to act as a mini greenhouse. Also, in that very open, coarse medium, I believe you are underwatering it, and in fact, likely cannot overwater it. Rather than using the moisture content of the medium as the guideline, look at the velamen on the roots. It'll be green when watered, and when it had turned back to the silvery-white color, then is the time to water again.
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