The Quaife is a TorSen type differential brake, and my impression is that one of their main drawbacks is that they struggle to get the locking going when one wheel has no traction. That could be when one wheel is on ice, or in the air. In your application, you still have the ediff in addition to the Quaife. That means that if the Quaife has issues with too limited traction, the ediff will provide that by braking the spinning wheel. It should be a winning combination, and seems to work very well in your video.
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