I looked at the provided demo animations in Unity and in each of them the legs -> the whole body tremble a little. Is this how it should be?
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60-70% I would say. In RoughDoggy, the girl looks great (though the animation itself is still weird) but the guy jerks back and forth.
In addition to the FBX model, perhaps you should record a video of what it should look like in "reference quality"? I really don't understand the problem with the animation or my model.