In response to your PM...
If you gave an intramuscular (IM) injection, the insulin would absorb faster than usual. Looking at Milo's ss, it's a possibility, but I'm not-so-sure it's a probability. There's just not any data to confirm or deny. Chances are you simply nicked a capillary when you gave the shot.
The rise at the end of this cycle looks suspicious as far as being an IM injection, but the rise could also be chalked up to a bounce (from spending so much time in blues last night and possibly for awhile this morning) OR as Wendy mentioned, a high before a break.
In any case, I wouldn't spend any time dwelling on it. IMO, Milo is stuck and simply needs more juice to get things going again. Unless anything unusual happens between now and tomorrow morning, I would go ahead with an increase to 5.5 units BID as Chris and Wendy have suggested.
Just my thoughts...