Ok, I reckon we have two issues here.

First - the original question - is the jerky motion. I would be 95% certain that this is down to the CV setting. Get this right and a lot of what you are seeing will disappear. My guess is that your CAM application is generating G1 straight-line moves following the facet faces and the machine does a start-stop at each corner. If most of your work to date has been straight lines and circular arcs/curves that can use G2/G3 circular arcs motion would have been much smoother.

Second - can you improve the situation with a better, finer-mesh, model? The answer to that one, I suspect, is that it all depends. My last project was a shallow relief carving over a 150x120mm area, but the Z only varied by about 6mm over that area, with a lot of smooth surfaces. So, my relatively coarse mesh gave good results. A deeper carving with a lot of up-and-down in it might not have worked so well. In either case, though, both the CAM systems I use (vCarve and F360) would generate G1 straight line moves, and maybe a finer mesh would have generated even more corners. In any case, the effect would be masked by the use of CV. But then the end result will change depending on the tool used (esp. diameter), stepover, etc. I'm not sure if there are any CAM systems that are clever enough to generate gcode arcs for this kind of thing. I did once do some 3D carving like this where, seen from close up and in the right light, you could just make out the facets. Clearly the model mesh was a bit too coarse. But given that it was a house nameplate that would only be seen from at least 3-4ft, it was fit for purpose. It all depends...