From your description, it sounds like you are not enabling the 30% brake setting in the ESC to be utilized. If on the ground your prop is spinning (idling) from power at full low stick then your brake is not activated. Depending on the ESC typically the brake is activated at an endpoint setting somewhere between where the ESC arms and before idle is enabled.

After arming, activating the brake can be achieved during flight by toggling a switch between different flight modes (aka conditions) which have different low throttle endpoint settings, brake vs idle. Also depending on the ESC there may be settings that influence whether the brake is activated instantly or with a user definable delay time before enabling the brake. In addition, some ESC’s provide the ability when the brake is activated to ramp up to full brake power by configuring starting and end percentages of the brake's power.

If the above is true I would recommend getting the brake to activate before changing props.