How to Configure Camera for Enclosed Spaces

In my 3rd person game the player can enter vent shafts that are large enough for a crouched character to fit. To accompany this, I created a state for the camera so the look offset moves very low when the character crouches. However, when the character enters the area, the camera cannot cope, and continually clips above the top of the geometry, even though it clearly looks low enough when first entering.

How did you configure the camera for the area that triggers the crawl ability in the Agility add-on demo? It works perfectly there, and I'd just like to recreate that. I do not yet own the agility add-on as it is not needed for this project. Is the camera configuration there still possible to use in "normal" TPC or does it contain some feature exclusive to the Agility add-on?
 
For crawl I changed the look offset and the collision anchor offset on the adventure movement type.

Look Offset: 0.5, -1.1, -2.5
Collision Anchor Offset: 0, -1.1, 0
 
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