[Wharf Rat]

When the cooling system is on, it’s pulling moisture out faster than the beads can replace it. So, you RH drops until the system shuts down and the beads catch up. I do not know the capabilties of your controller. If possible, try reducing the size of the deadband. This will make the cooling system turn on more frequently, for shorter periods of time. So, the RH won’t pull down as much on any cycle.

Your measurement means is giving you a lot of info. Probably, the behavior you are seeing is pretty normal for a system like this. But, most folks aren’t aware because they can’t measure continuously.