I'd be inclined to stick with this dose a bit longer. There was clearly some action off of the shed the first day, as you surmised. I am wondering what Tubby's numbers looked like earlier today, given the low blue. He may be getting back on track. Generally, if the nadir is less than 200, we give the dose up to 5 days to see if it's working. You may need to try to get more than one spot check in just so you have a sense of whether Tubby will need a bit more insulin.