I own a vision plus with the old remote so I can only make assumptions with the ver 2 upgraded transmitter.
I think your transmitter set is to "basic" in the phantom assist 3.6. Try the "upgrade" mode in the Phantom assist 3.6.
Just to clarify
In the phantom assist 3.6 there is 2 options for the transmitter.
Upgrade Mode (new transmitter) = relative rate of travel. Simply the further you push it, the faster the camera will move. When you release, it will stop. This is the mode you want as the wheel has a return to centre spring/position. This behaves like the DJI app when you have the gyro on. This is much easier to fly and film.
Basic mode = absolute. Simply, the location of the wheel will reflect where it is looking. So if the wheel is at top, it will look up. If the wheel is at bottom, it will look down. If the wheel is at middle, it will look 45 degrees. This is not good with the new controller as the wheel has a return to centre and therefore will look at 45 degrees when released (note, for this to work, you must calibrate the X1 properly otherwise it will move only a few degrees). This is much more difficult to fly and film as you need to gradually control the cameras movements.
I hope this helps.. and correct me if I'm wrong..