So you haven't given any insulin in 15 hours, right? Are you thinking you will give some? If you do, can you test and shoot 12 hours from now?
One of the things that will really help is to figure out when you can consistently shoot 12 hours apart. It looks like you have shot early and late, and that confuses the picture and isn't using the insulin to its best advantage.
We expect a smile shaped curve with ProZinc. It starts at amps, dips down to its lowest point at nadir (usually around 6 hours after the shot) and then goes back up to a number in the same range at pmps.