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I'm not a HVAC expert and I don't have data, but we do use a mini split for cooling in the summer. We're in Zone 6, so our AC use is mostly during a few heat waves for a few days or a week at a time, then we open the house back up when we can.
I would recommend "set it and forget it" and just put the fan on auto. We just put our Mitsubishi unit on 70F, auto fan, and leave it.
If you want to save some energy during times of peak demand, you could bump it up to 72F (for example), but don't constantly shut it off overnight or bump the set temp way up. You're just making the mini split work harder when you turn it back on or when you go back down to 70F. When you shut it off or turn the set temp above the room temp, you're also losing the dehumidifying part of the AC, which is why your humidity spikes.
If you do turn the cool mode off when you don't need AC, I believe it's good to run it in just the fan mode for a bit (an hour or two?) to dry any condensation off the coils. You might see something in the manual about this.