I thought the recomendation to wiggle the mouse was mostly in training/tricking them to eat f/t.
Does that mean that even if you don't wiggle it, the snake may start constricting when they are older? Because mine hasn't tried to constrict his food yet, sometimes he'll get excited and curl up weird when he's eating, but never constrict. Someone I talked to said their snake never bothered constricting pinkies, but once they got to bigger food, the snake constricts like crazy.