Cant say I have experienced any jerkiness on down changes" when having a play", I don't find there is a massive amount of engine braking on down changes, even when I am calling for down changes at relatively high revs, nothing like you would experience with a manual gearbox.
I don't quite understand the "downshifts are smoother during acceleration" part, but yes, being in the right gear coming into the corner is a must for me.