My dog waited the full 90 seconds no matter whether I was looking or not, which resulted in your placing him dead center in the middle of the graph. Which I understand (after reading your explanation). However, FYI, I just tried a test where I told him to leave the treat alone, then left the room and closed the door behind me. This door has a vent at eye level, and I watched him after leaving the room. He started to go to it, then stopped himself, then waited another 10 to 15 seconds, then ate the treat. So that shows he's wily if he's sure he's unobserved. Maybe you could add this test -- at least in cases of dogs that go the full 90 seconds for all the other Cunning tests.