I'm surprised you didn't get any answers to this post. I'm sure you got it all worked out. I am curious why you would jack up and remove the wheels before each toe adjustment. With enough room I like the technique were you mark the back side of the tires, measure and then roll the truck forward till those mark are at the front then measure.
I'm not sure if it's right or the best way but I first point the wheels straight, then center the pitman arm to the box using the mark on the sector shaft, then with the drag link disconnected I count the rotations from lock to lock, turn back half of the total, at that point if the steering wheel is off center I would pull it and recenter it. After that adjust the drag link until it drops right onto the pitman arm.
