Does the bucking ever occur under hard acceleration for you?
I’ve ran it up to 108mph in normal, sport, and Baja 2wd. From a dead stop to floored, The torque is a beast and it will buck off the line. It does shift hard and buck in each of the modes when I’m wide open. In Normal automatic driving, it would shift hard at first but I think the tranny is learning because it’s getting a lot smoother. In normal manual driving, it still shifts hard but I think that’s more of a result of me not timing the shift correctly.
This transmission will pull and pull a lot in each gear. If you accelerate hard (like floor it) you will feel it buck. The torque wants to spin the tires fast. These tires are awesome because they just grip and run. It’s an amazing truck and an awesome feeling driving it.
All of that to say, I feel what you are experiencing is normal. It I’m not a ford tech and I wouldn’t overlook it if you don’t feel good about it.