Does DAZ have any sort of animation curve editor, or some other way to adjust the ease-ins and ease-outs between key frames? What I am seeing there is a solid start, and fairly impressive considering it was made in vanilla DAZ, but it's very mechanical in nature at the moment. Typically in 3D animation you would rough in a scene pretty quick to the point you've got it there, then you would start fine tuning the transition curves to make the movements feel more natural. I'm going to guess though that DAZ lacks such tools, considering how infrequently people use it for producing animations.
Here's a nice example of how to deal with key frame interpolations in Blender:
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The guy who did that tutorial actually has a pretty nice looking
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course on that same site, though it's a commercial offering, but I would imagine with some digging around on the net you could find a torrent or download for it somewhere if you didn't want to pay. I've checked out a few of their courses in the past and they are always top quality as all the guys associated with that site are seasoned professionals with many years of industry experience in the areas they cover in their courses.