A lot of the smoothing issues come down to the animation clips themselves and how they are meant to be used. The mocap animations are “raw” so they were included without any proper editing to ensure they’d smoothly work together. You can try out animations from Mixamo: https://www.mixamo.com/#/?page=1&type=Motion%2CMotionPack, I’ve had good results with those. Sometimes they can be a bit quirky in Unity, but for the most part the movement animations work well together without any issues.
