He does rise fast. I would guess it is either that he is unusually sensitive to food and it raises the numbers or if, for him, when the insulin is gone, he immediately shoots up.
The midnight number is good, but notice today how the number from +4 changed dramatically by +6 and then he surfed awhile. If you had just seen the +4 today, it would have looked like a high cycle.
You are not driving me crazy. I just wish I could figure him out and help you.