To be honest in Unity is always a gambling when you use the 3D Lights to understand how strong they are going to be. :)
I mean the movement patterns of the ghosy. Most of the time I experienced them staying very close to the same spot instead of moving around, so when they appear on doors or hallway I had no choice but to run into them to get to the other side.
Did you use a NavMesh agent for their movements?