A little more investigation into the AFD:
At a certain point while the AFD is being adjusted upward it will dramatically change from being flat-ish to being angled up toward the toe (the upward angle will eventually match that of a GripWalk sole.) If you don't continue adjusting all the way through the change in angle a hard push down on the toe of the boot can move the AFD back to flat, creating a huge gap between the sole and the AFD.
I don't know if the same issue is present for touring soles, but if you're in a GripWalk boot press down hard on the toe as you're adjusting to make sure you've made it all the way past the AFD's change in angle.