Well several things could be happening but there really isn't enough test data to say exactly what is causing it.
More than likely its one of two things. Either he's going lower than he's use to overnight and bouncing back up. or its new dose Wonkiness. Which comes from the shed readjusting to the dose increase.
I know I sound like a broken record but really need BOTH preshots daily as well as several random spot checks throughout the day. I find the bare minimum for me to figure my cats out is 4 times a day and if they are really confusing me I test even more often. A lot of times I've tested Autumn and Casey at amps,+1,+3,+5,+7,+9,+11,&pmps on one day then the next day I tested them at amps,+2,+4,+6,+8,+10 &pmps to help me see how their bodies were using the insulin throughout the day. Which is exactly what the vet does when you take him in for a curve. Except at the vet's he's locked in a cage and they are drawing blood from a vein usually in the leg. And ear pick is much less painful or scary.
Mel and The Fur Gang