Sorry it'* taken me so long to get back to this. I finally had the chance to drive the car due to my wife having other problems with it (see my latest new thread) and it seemed to be 100% better!
I drove in the city for about 10-12 miles and got up to speed so that the torque converter would lock up, then ease into the gas, but not enough for a downshift. Each time I did that (probably a dozen) I did not get any of the surging.
So, for now, it seems that a new TPS has corrected my issue! If the issue resurfaces I'll resurect this thread.