We usually recommend that you put 0 (zero) in the units column if you skip. There are built in formulas behind the scenes, that will take the data on the World version of the SS and transfer them to the US side of the SS. Since the NS for units did not show over there, I'm guessing (speculating) the formula is expecting a number in that cell, and will not do the data transfer automatically.
Cosmo speaks up, and speaks up LOUDLY for canned food.
Good call on skipping the dose again. His BG levels are simply not high enough to give him any insulin.
Sometimes, the change to a low carb diet can make all the difference. That may be the case with Cosmo. All paws crossed here that Cosmo continues to do well.
Right now, Cosmo's BG levels are in the normal range of a non-diabetic cat. Or the normal range for a cat that is off insulin or being tightly controlled with insulin. That is good news!
The "game plan" from my perspective is to not give Cosmo any insulin, unless his BG levels shoot up dramatically. Since Prozinc is an in-and-out insulin, rarely lasting beyond the 12 hour cycle, there is no "depot" to take into account like there would be with one of the L (lantus or levemir) insulins. So there is no leftover insulin that would be affecting Cosmo's BG levels at this point, that could cause his BG levels to continue to drop as the "depot" releases insulin. Again, Prozinc is an insulin that rarely lasts beyond 12-14 hours. No insulin, no fear of hypo with Prozinc.
So there are no worries at this point with you doing the switch to all wet food ASAP. Except for the possibility of some digestive upset. So my opinion is that the food switch to all wet food done quickly is fine. But if there is any diarrhea or vomiting, then let us know. I see no problems with you eliminating the dry food for Cosmo.