Honestly, I think this is consider normal. As I've stated in my post above, even the new 2011 Mazda3 rental still has a slight jerk when coming to a full stop with the transmission in Auto mode. On a side note, my bro's 2002 Honda Civic does not have this jerk but you can't see what gear the car is in though...

I've never got around to bringing my car to get the transmission mount checked since it would cost money for such a small problem. My passenger mount was replaced back in 46k. I just practice using manual when stopping the car now.

Let me know if you find a solution.