Isn't the Z offset how high the camera is off the ground? By this I mean that if the angle of attack were set to 360, the camera would be looking directly horizontally. If the Z offset were 0, the camera would be at ground level, but if the Z offset were 30, it would be floating above the ground. That's how it is in the Camera editor, but I'll need to check if it's the same way w/trigs.