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Having seen some vids of the differential bouncing around, I'd almost guarantee that changing the diff bushings would help with a lot of the bucking and jerking.
Soft engine and transmission mounts, and soft diff bushings make for a lot of slop, which can cause the bucking and jerking. I think most of it is the soft diff bushings. I can feel it when shifting, and when getting on, or off throttle at low speeds.
I agree, this car is very hard to drive smoothly at low speeds. Shifting at higher rpm's helps a lot. I find it near impossible to be silky smooth when shifting below 4000 rpm.
As already suggested, when slowing, clutching in or popping out of gear and coasting works well.
The stock tune has the engine rpm's hovering above idle, and then finally dropping to idle when you get off the gas. This, coupled with the soft mounts and bushings, has the car "hunting", neither accelerating, or decelerating, and this causes the jerking when slowing.
A good tune I think would help with this a lot. One that has the rpm's dropping quickly to idle without hovering higher for a bit will have the car smoothly decelerating at low speeds.
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