I really do think it will be safe if you need to get some sleep. Prozinc doesn't have a direct connection to the PS number the way that Novolin does. If the kitty is on all low carb food, the dosing is consistent, and the +2 isn't dramatic, then most kitties will flatten along the bottom of the cycle and just surf until the insulin starts to wear off. There are kitties who like the drama, but most of the time you can see that coming in the early numbers. Of course if you're just curious, or want to try to catch a green, then by all means keep going. But if your eyes are heavy, I don't see anything in these numbers that would give me reason to worry.