Here we are at the conundrum of dealing with feline diabetes. My view of this is that yesterday Smokey was still in a bounce in the morning and then it "broke" which is exactly what we wanted to happen. Today she followed a more expected course with Caninsulin in that she reached a low at +3 instead of at +6. Nadirs (lowest reading) can move a bit but with Caninsulin, they are more often around +3 or +4 than at +6. If I were you, I would think about dropping her to 1.25u tonight just to be safe. It's obvious the dose the vet had her on was way too high and she now has other ideas but things are definitely moving in the right direction.
Food wise do you mean Taste of the Wild. If so it's about 22% carbs which while too high is not the worst you can get. I was feeding that to my girl for a time while I tried to find something with less carbs available in Canada that she would eat. You are definitely lucky to be near the border and able to get Young Again (she says as her green eyes get greener

). When you do get the Young Again, it's likely you are going to see Smokey's need for insulin drop considerably so I'd make the switch slowly over a few days to a week and monitor Smokey closely.