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Check the mass flow at the terminal during the off cycle -- sometime these fast ramp rates are caused because the system is still on and delivering unconditioned outside air into the zone (when you think it should be off).

When I look at these plots I see zones with too much load for the system to really be turned off. And typically the setup thermostat temperature for cooling during unoccupied times would be higher than 25C . But otherwise this is pretty much what happens with that manager when the loads are high. If the zones cannot handle cycling then leave the air handler running as normal.