Hi: I think he probably got his shot. I think he is bouncing from the erratic dosing and possibly some of his nice numbers. Lantus likes consistency.
Your dosing:
12/8 am 3.50 pm 3.00
12/9 am 3.50 pm 4.00
12/10 am 3.75
I think if you pick a dose and stick with it for at least 6 cycles you will see what he is doing. He earned a dosecreas to 3.75. I know with Tuffy, I had to just skinny the doses otherwise it did not hold. Also, is Tubby carb sensitive? I learned to use LC to see if I could get her numbers up rather than HC.
Hope he levels out for you. Have a good night.