Another idea: Rest your arm against the edge of the cage or a ledge or something, which will stabilize your arm more. If your problem is with more like a jerk/jumping-type motion and not letting go of the tongs, just stabilizing your arm could help.
What if you just didn't even watch your bp go for the food? Just look away? I dunno. Just a thought. I'm open to that idea being shut down by others on here if needed, lol