Hi,
what do you mean exactly? Does the crank spin during a trick when you roll forward? If the crank spins backwards during backwards riding, the system is not disengaged.
For this type of hub I would recommend to tighten the cone nuts only by hand until no side to side play is left.
In general you should not have your cranks set to move to easily. Most people tighten their chain for this purpose. If the crank moved during a trick, the hub can engage unintentionally.
Was the hub brand new? Eventually it takes some time, but I would not expect more than two or three sessions. My KHE-type coasters were perfect from the first moment.