Yeah, it sounds like your throttle valve pressure is good. What is the stall of your convertor? I went with a 1800/2000 stall so that I could use the trans to help run the rpm's in a higher range since I was going to use a high rise manifold. Add in the 3.9 rear ratio and the combo is quite smooth.

I can honestly say I haven't heard of an AOD causing a bucking and surge. But I haven't known anyone using a lockup convertor either.

What happens when your decelerating and kick the trans in neutral? Can you "feel" or hear the tranny shift down as the car comes to a stop? And something else that jumps out at me - you say in the reply above, "Once I get the trans to shift down as it slows down, the bucking will stop." but how are you getting the trans to shift down? It is the job of the govenor to place the trans in any particular gear, unless you have a modified or manual valve body? Even a stock valve body won't drop the trans a gear if you shift down with the shift handle. The govenor will wait for the correct rpm to shift.