How to stop OVRPlayerController stepping up small distances?

Like if he walks over a crate the camera jumps a little as he sets up onto it. But I want to stop any of that at all so he basically moves perfectly smoothly along the ground at all times. So ideally I'd just be able to take away some kind of collision/detection near the bottom of the character, so he passes through small things on the ground, but leave the rest of him so he can still bang into walls and stuff.

Note: I tried stuff like moving the whole OVCPlayerController up and increasing/decreasing the Step Offset setting in the Hierarchy, but they didn't seem to stop him jump up onto small bits of stuff in the level.