Ah I see.
So what it is is the model’s anchor offset. Not everything’s anchor (also possibly known as root) is in the middle of the model. For instance, the sample characters need to be placed at -89 in relation to the actor’s root to be “on the ground”.
In this case, after my tests, it seems -3.25 puts the cube on the ground. But that’s not the capsule, that’s just the cube.
That being said, I did encounter some weirdness like you were saying. Honestly this is a matter of camera magic, I would suggest making everything larger for your scene. In Toy Story, for reference Woody is 6ft tall. His spot (the bed) is 40-50ft across and Andy is a 10 story building. You want to try to make your characters determine what your scale is. 
Creating games and movies is all illusion! It will likely be a lot simpler than creating everything in millimeter or smaller measurements of movement.
Hope that helps either way!